Complete security hardening and MFA enforcement

.env.example

@@ -44,6 +44,8 @@ CONTACT_FROM_EMAIL=CodeForge <onboarding@resend.dev>
 # skipped outside production but fails closed (blocks all
 # submissions) when NODE_ENV=production.
 TURNSTILE_SECRET_KEY=your_turnstile_secret_key
+# Comma-separated production hostnames returned by Turnstile Siteverify.
+TURNSTILE_HOSTNAMES=codeforgedev.vercel.app
 
 # Cloudflare Turnstile site key — public, used client-side to render
 # the widget. Must be set together with TURNSTILE_SECRET_KEY above,
@@ -55,3 +57,6 @@ VITE_TURNSTILE_SITE_KEY=your_turnstile_site_key
 # but setting your own value is recommended.
 CONTACT_IP_HASH_SALT=choose_a_random_string
 
+
+# Server-only random salt used to hash client IPs for login lockout keys.
+LOGIN_IP_HASH_SALT=replace_with_a_long_random_secret

.github/workflows/security.yml

@@ -0,0 +1,32 @@
+name: Security checks
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  application:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Dependency audit
+        run: npm audit --audit-level=high