Implement platform settings (Stage 9)

- Wire settings to actual platform behavior: maintenance mode, registration toggle,
  notification emails, curator feedback emails, email verification flag
- Add logo (logoUrl, showLogo) and social network links (YouTube, VK, Telegram) settings
- Show logo + school name dynamically in student layout header
- Add footer to student layout with org requisites and social links
- Register page: read settings server-side, validate terms checkbox with legal links
- Login page: show notice when redirected from closed registration
- Settings form: add Logo and Social Networks sections

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/(auth)/login/page.tsx

@@ -1,17 +1,35 @@
+import { getSetting } from "@/lib/settings";
 import { LoginForm } from "./login-form";
 
-export default function LoginPage() {
+export default async function LoginPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ notice?: string }>;
+}) {
+  const [schoolName, { notice }] = await Promise.all([
+    getSetting("schoolName"),
+    searchParams,
+  ]);
+
   return (
     <div className="min-h-screen flex items-center justify-center" style={{ backgroundColor: "var(--background)" }}>
       <div className="w-full max-w-sm">
         <div className="text-center mb-8">
           <h1 className="text-2xl font-bold tracking-wide" style={{ color: "var(--foreground)" }}>
-            Second Brain
+            {schoolName}
           </h1>
           <p className="mt-1 text-sm uppercase tracking-widest" style={{ color: "var(--muted-foreground)", fontSize: "0.65rem" }}>
             Образовательная платформа
           </p>
         </div>
+        {notice === "registration_closed" && (
+          <div
+            className="mb-4 px-4 py-3 text-sm text-center"
+            style={{ border: "2px solid var(--border)", color: "var(--muted-foreground)" }}
+          >
+            Регистрация временно закрыта. Обратитесь к администратору.
+          </div>
+        )}
         <div className="card-aubade p-8">
           <LoginForm />
         </div>

src/app/(auth)/register/page.tsx

@@ -1,19 +1,32 @@
+import { redirect } from "next/navigation";
+import { getSettings } from "@/lib/settings";
 import { RegisterForm } from "./register-form";
 
-export default function RegisterPage() {
+export default async function RegisterPage() {
+  const settings = await getSettings();
+
+  if (settings.registrationEnabled !== "true") {
+    redirect("/login?notice=registration_closed");
+  }
+
   return (
     <div className="min-h-screen flex items-center justify-center" style={{ backgroundColor: "var(--background)" }}>
       <div className="w-full max-w-sm">
         <div className="text-center mb-8">
           <h1 className="text-2xl font-bold tracking-wide" style={{ color: "var(--foreground)" }}>
-            Second Brain
+            {settings.schoolName}
           </h1>
           <p className="mt-1 text-sm uppercase tracking-widest" style={{ color: "var(--muted-foreground)", fontSize: "0.65rem" }}>
             Образовательная платформа
           </p>
         </div>
         <div className="card-aubade p-8">
-          <RegisterForm />
+          <RegisterForm
+            showTermsCheckbox={settings.showTermsCheckbox === "true"}
+            privacyPolicyUrl={settings.privacyPolicyUrl}
+            termsUrl={settings.termsUrl}
+            offerUrl={settings.offerUrl}
+          />
         </div>
       </div>
     </div>

src/app/(auth)/register/register-form.tsx

@@ -4,10 +4,18 @@ import { useState } from "react";
 import Link from "next/link";
 import { signUp } from "@/lib/auth-client";
 
-export function RegisterForm() {
+interface Props {
+  showTermsCheckbox: boolean;
+  privacyPolicyUrl: string;
+  termsUrl: string;
+  offerUrl: string;
+}
+
+export function RegisterForm({ showTermsCheckbox, privacyPolicyUrl, termsUrl, offerUrl }: Props) {
   const [name, setName] = useState("");
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
+  const [termsAccepted, setTermsAccepted] = useState(false);
   const [error, setError] = useState("");
   const [loading, setLoading] = useState(false);
   const [success, setSuccess] = useState(false);
@@ -22,8 +30,18 @@ export function RegisterForm() {
     fontFamily: "inherit",
   } as React.CSSProperties;
 
+  const legalLinks = [
+    { url: privacyPolicyUrl, label: "Политику конфиденциальности" },
+    { url: termsUrl, label: "Согласие на обработку данных" },
+    { url: offerUrl, label: "Договор-оферту" },
+  ].filter((l) => l.url);
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault();
+    if (showTermsCheckbox && !termsAccepted) {
+      setError("Необходимо принять условия для продолжения");
+      return;
+    }
     setError("");
     setLoading(true);
 
@@ -102,6 +120,38 @@ export function RegisterForm() {
           placeholder="Минимум 8 символов"
         />
       </div>
+
+      {showTermsCheckbox && (
+        <label className="flex items-start gap-2 cursor-pointer">
+          <input
+            type="checkbox"
+            checked={termsAccepted}
+            onChange={(e) => setTermsAccepted(e.target.checked)}
+            className="mt-0.5 flex-shrink-0"
+            style={{ width: "16px", height: "16px", accentColor: "var(--foreground)" }}
+          />
+          <span className="text-xs" style={{ color: "var(--muted-foreground)" }}>
+            Я принимаю{" "}
+            {legalLinks.length > 0
+              ? legalLinks.map((l, i) => (
+                  <span key={l.url}>
+                    <a
+                      href={l.url}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                      className="underline"
+                      style={{ color: "var(--foreground)" }}
+                    >
+                      {l.label}
+                    </a>
+                    {i < legalLinks.length - 1 ? ", " : ""}
+                  </span>
+                ))
+              : "условия использования платформы"}
+          </span>
+        </label>
+      )}
+
       {error && (
         <p className="text-xs py-2 px-3" style={{ border: "2px solid oklch(0.577 0.245 27.325)", color: "oklch(0.577 0.245 27.325)" }}>
           {error}

src/app/(student)/layout.tsx

@@ -16,6 +16,17 @@ export default async function StudentLayout({ children }: { children: React.Reac
     if (maintenance === "true") redirect("/maintenance");
   }
 
+  const [schoolName, logoUrl, showLogo, socialYoutube, socialVk, socialTelegram, orgRequisites] =
+    await Promise.all([
+      getSetting("schoolName"),
+      getSetting("logoUrl"),
+      getSetting("showLogo"),
+      getSetting("socialYoutube"),
+      getSetting("socialVk"),
+      getSetting("socialTelegram"),
+      getSetting("orgRequisites"),
+    ]);
+
   const isImpersonating = !!(session.session as { impersonatedBy?: string }).impersonatedBy;
 
   return (
@@ -25,8 +36,12 @@ export default async function StudentLayout({ children }: { children: React.Reac
         className="sticky top-0 z-10 flex items-center justify-between px-6 py-3"
         style={{ borderBottom: "2px solid var(--border)", backgroundColor: "var(--background)" }}
       >
-        <Link href="/dashboard" className="font-bold tracking-wide" style={{ color: "var(--foreground)" }}>
+        <Link href="/dashboard" className="flex items-center gap-2 font-bold tracking-wide" style={{ color: "var(--foreground)" }}>
-          Second Brain
+          {logoUrl && showLogo === "true" && (
+            // eslint-disable-next-line @next/next/no-img-element
+            <img src={logoUrl} alt={schoolName} className="h-6 w-auto object-contain" />
+          )}
+          {schoolName}
         </Link>
         <div className="flex items-center gap-4">
           <span className="text-sm" style={{ color: "var(--muted-foreground)" }}>{session.user.name}</span>
@@ -34,6 +49,35 @@ export default async function StudentLayout({ children }: { children: React.Reac
         </div>
       </header>
       <div className="flex-1 flex flex-col">{children}</div>
+      {(socialYoutube || socialVk || socialTelegram || orgRequisites) && (
+        <footer
+          className="px-6 py-4 flex flex-col sm:flex-row items-center justify-between gap-3 text-xs"
+          style={{ borderTop: "2px solid var(--border)", color: "var(--muted-foreground)" }}
+        >
+          {orgRequisites && (
+            <p className="whitespace-pre-line text-center sm:text-left">{orgRequisites}</p>
+          )}
+          {(socialYoutube || socialVk || socialTelegram) && (
+            <div className="flex items-center gap-4 flex-shrink-0">
+              {socialYoutube && (
+                <a href={socialYoutube} target="_blank" rel="noopener noreferrer" className="hover:underline">
+                  YouTube
+                </a>
+              )}
+              {socialVk && (
+                <a href={socialVk} target="_blank" rel="noopener noreferrer" className="hover:underline">
+                  VK
+                </a>
+              )}
+              {socialTelegram && (
+                <a href={socialTelegram} target="_blank" rel="noopener noreferrer" className="hover:underline">
+                  Telegram
+                </a>
+              )}
+            </div>
+          )}
+        </footer>
+      )}
     </div>
   );
 }

src/app/curator/homework/[submissionId]/actions.ts

@@ -5,6 +5,7 @@ import { auth } from "@/lib/auth";
 import { headers } from "next/headers";
 import { revalidatePath } from "next/cache";
 import { sendFeedbackReceivedEmail } from "@/lib/email";
+import { getSetting, asBool } from "@/lib/settings";
 
 async function requireCurator() {
   const session = await auth.api.getSession({ headers: await headers() });
@@ -78,14 +79,17 @@ export async function submitFeedback(
   });
 
   const { lesson } = submission.homework;
-  const lessonUrl = `${process.env.BETTER_AUTH_URL ?? "https://school.second-brain.ru"}/courses/${lesson.module.course.slug}/lessons/${lesson.id}`;
+  const notifySetting = await getSetting("notifyStudentOnFeedback");
-  await sendFeedbackReceivedEmail(
+  if (asBool(notifySetting)) {
-    submission.user.email,
+    const lessonUrl = `${process.env.BETTER_AUTH_URL ?? "https://school.second-brain.ru"}/courses/${lesson.module.course.slug}/lessons/${lesson.id}`;
-    submission.user.name,
+    await sendFeedbackReceivedEmail(
-    lesson.title,
+      submission.user.email,
-    data.text,
+      submission.user.name,
-    lessonUrl
+      lesson.title,
-  );
+      data.text,
+      lessonUrl
+    );
+  }
 
   revalidatePath("/curator/homework");
   revalidatePath(`/curator/homework/${submissionId}`);

src/components/admin/settings-form.tsx

@@ -432,6 +432,62 @@ export function SettingsForm({ initial }: { initial: Settings }) {
         </Field>
       </Section>
 
+      {/* ── 7. Логотип ── */}
+      <Section
+        title="Логотип"
+        hint="URL изображения логотипа школы. Отображается рядом с названием в шапке личного кабинета ученика."
+      >
+        <Field label="URL логотипа">
+          <input
+            value={s.logoUrl}
+            onChange={(e) => set("logoUrl", e.target.value)}
+            placeholder="https://..."
+            style={{ ...inputStyle, fontFamily: "var(--font-mono)" }}
+            {...focusHandlers}
+          />
+        </Field>
+        <Toggle
+          label="Показывать логотип в шапке"
+          hint="Если выключено — логотип скрыт, отображается только название школы."
+          checked={bool("showLogo")}
+          onChange={(v) => set("showLogo", v ? "true" : "false")}
+        />
+      </Section>
+
+      {/* ── 8. Социальные сети ── */}
+      <Section
+        title="Социальные сети"
+        hint="Ссылки отображаются в подвале личного кабинета ученика."
+      >
+        <Field label="YouTube (URL канала)">
+          <input
+            value={s.socialYoutube}
+            onChange={(e) => set("socialYoutube", e.target.value)}
+            placeholder="https://youtube.com/@..."
+            style={{ ...inputStyle, fontFamily: "var(--font-mono)" }}
+            {...focusHandlers}
+          />
+        </Field>
+        <Field label="VK (URL сообщества)">
+          <input
+            value={s.socialVk}
+            onChange={(e) => set("socialVk", e.target.value)}
+            placeholder="https://vk.com/..."
+            style={{ ...inputStyle, fontFamily: "var(--font-mono)" }}
+            {...focusHandlers}
+          />
+        </Field>
+        <Field label="Telegram (ссылка на канал или группу)">
+          <input
+            value={s.socialTelegram}
+            onChange={(e) => set("socialTelegram", e.target.value)}
+            placeholder="https://t.me/..."
+            style={{ ...inputStyle, fontFamily: "var(--font-mono)" }}
+            {...focusHandlers}
+          />
+        </Field>
+      </Section>
+
       {/* Bottom save button */}
       <div className="flex justify-end pb-4">
         <button

src/lib/actions/student-actions.ts

@@ -5,6 +5,7 @@ import { auth } from "@/lib/auth";
 import { headers } from "next/headers";
 import { revalidatePath } from "next/cache";
 import { sendHomeworkSubmittedEmail } from "@/lib/email";
+import { getSettings, parseNotificationEmails, asBool } from "@/lib/settings";
 
 // ── Lesson Progress ───────────────────────────────────────────────────────────
 
@@ -72,20 +73,24 @@ export async function submitHomework(
     });
     submissionId = created.id;
 
-    const [lesson, admins] = await Promise.all([
+    const [lesson, settings] = await Promise.all([
       prisma.homework.findUnique({
         where: { id: homeworkId },
         include: { lesson: { select: { title: true } } },
       }),
-      prisma.user.findMany({
+      getSettings(),
-        where: { role: { in: ["admin", "curator"] } },
-        select: { email: true, name: true },
-      }),
     ]);
-    if (lesson) {
+    if (lesson && asBool(settings.notifyOnHomework)) {
+      const configuredEmails = parseNotificationEmails(settings.notificationEmails);
+      const recipients = configuredEmails.length > 0
+        ? configuredEmails.map((email) => ({ email, name: "" }))
+        : await prisma.user.findMany({
+            where: { role: { in: ["admin", "curator"] } },
+            select: { email: true, name: true },
+          });
       await Promise.all(
-        admins.map((a) =>
+        recipients.map((r) =>
-          sendHomeworkSubmittedEmail(a.email, a.name, session.user.name, lesson.lesson.title, submissionId)
+          sendHomeworkSubmittedEmail(r.email, r.name, session.user.name, lesson.lesson.title, submissionId)
         )
       );
     }

src/lib/settings.ts

@@ -33,6 +33,15 @@ export const SETTINGS_DEFAULTS = {
   curatorCanAnswerQuestions: "true",
   curatorCanSeeStudents: "true",
 
+  // Logo
+  logoUrl: "",
+  showLogo: "true",
+
+  // Social networks
+  socialYoutube: "",
+  socialVk: "",
+  socialTelegram: "",
+
   // Code injection
   headCode: "",
   bodyCode: "",