Add forgot-password and reset-password flow

Users can now request a password reset link via email. Better Auth
sendResetPassword callback sends a branded email via Resend. Login
page shows success notice after password is set.

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

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

@@ -95,12 +95,14 @@ export function LoginForm() {
       >
         {loading ? "Вход..." : "Войти"}
       </button>
-      <p className="text-center text-xs" style={{ color: "var(--muted-foreground)" }}>
-        Нет аккаунта?{" "}
+      <div className="flex items-center justify-between text-xs" style={{ color: "var(--muted-foreground)" }}>
+        <Link href="/forgot-password" className="underline" style={{ color: "var(--muted-foreground)" }}>
+          Забыли пароль?
+        </Link>
         <Link href="/register" className="underline" style={{ color: "var(--foreground)" }}>
           Зарегистрироваться
         </Link>
-      </p>
+      </div>
     </form>
   );
 }