Add 2FA, email + password reset, and batch-7 pages

Auth (hand-built on the auth core):
- 2FA: User model gains two_factor_secret/recovery_codes/confirmed_at (+ idempotent
  MariaDB migration). authorize() requires a valid TOTP code when 2FA is confirmed
  (secret decrypted via Laravel APP_KEY, fail-closed). Two-step login (precheckLogin
  reveals the code field). /settings/2fa enable/confirm/disable flow.
- Password reset: nodemailer email service; PasswordReset model + migration;
  /forgot (request, generic response) + /reset (token sha256 + 1h TTL, sets argon2id
  hash). Login links to forgot.

Batch 7 (parallel agents): /admin/commandocentrum (RCON controls + emulator_errors),
social write actions (friend request + guild forum new thread), /help/[category],
/badges (public). env: APP_KEY, APP_URL, SMTP_*. Nav extended.

Verified: tsc exit 0, vitest 48/48, next build exit 0 (64 page routes).

src/lib/auth.ts

@@ -2,7 +2,9 @@ import NextAuth from "next-auth";
 import Credentials from "next-auth/providers/credentials";
 import Discord from "next-auth/providers/discord";
 import Google from "next-auth/providers/google";
+import { LaravelEncrypter } from "@/lib/auth/laravel-encrypter";
 import { checkLogin } from "@/lib/auth/password";
+import { verifyTotp } from "@/lib/auth/totp";
 import { prisma } from "@/lib/prisma";
 import { env } from "@/env";
 
@@ -15,6 +17,7 @@ export const { handlers, signIn, signOut, auth } = NextAuth({
       credentials: {
         username: { label: "Username", type: "text" },
         password: { label: "Password", type: "password" },
+        code: { label: "2FA code", type: "text" },
       },
       authorize: async (credentials) => {
         const username = String(credentials?.username ?? "").trim();
@@ -37,6 +40,19 @@ export const { handlers, signIn, signOut, auth } = NextAuth({
           });
         }
 
+        // Two-factor: if enabled, a valid TOTP code is required. The secret is
+        // Laravel-encrypted with APP_KEY (fail closed if it cannot be read).
+        if (user.twoFactorConfirmedAt && user.twoFactorSecret) {
+          const code = String(credentials?.code ?? "").trim();
+          if (!code || !env.APP_KEY) return null;
+          try {
+            const secret = new LaravelEncrypter(env.APP_KEY).decrypt(user.twoFactorSecret);
+            if (!verifyTotp(code, secret)) return null;
+          } catch {
+            return null;
+          }
+        }
+
         return { id: String(user.id), name: user.username, rank: user.rank };
       },
     }),