Add manual user creation in admin panel

- Server action createUser() with bcrypt password hash + Account record
- Form with name, email, password (show/hide + generate), role, emailVerified toggle
- Optional welcome email toggle (bypasses auto-hook for admin-created users)
- /admin/users/new page with breadcrumb navigation
- After creation, redirects to the new user's profile page
- "Добавить пользователя" button on the users list page

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

src/app/admin/users/page.tsx

@@ -1,6 +1,7 @@
 import { prisma } from "@/lib/prisma";
 import { Badge } from "@/components/ui/badge";
 import Link from "next/link";
+import { UserPlus } from "lucide-react";
 
 const roleLabel: Record<string, string> = {
   admin: "Администратор",
@@ -22,9 +23,18 @@ export default async function UsersPage() {
 
   return (
     <div className="p-8">
-      <div className="mb-6">
-        <h1 className="text-2xl font-semibold text-slate-800">Пользователи</h1>
-        <p className="text-slate-500 text-sm mt-0.5">{users.length} пользователей</p>
+      <div className="mb-6 flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-semibold text-slate-800">Пользователи</h1>
+          <p className="text-slate-500 text-sm mt-0.5">{users.length} пользователей</p>
+        </div>
+        <Link
+          href="/admin/users/new"
+          className="btn-aubade btn-aubade-accent flex items-center gap-1.5 px-4 py-2 text-sm"
+        >
+          <UserPlus size={14} />
+          Добавить пользователя
+        </Link>
       </div>
 
       <div className="bg-white border border-slate-200 rounded-2xl overflow-hidden">