feat: add Bearer token authentication

All /api/* routes require Authorization: Bearer <token>.
Tokens are configured via API_TOKENS env var (comma-separated for multiple).
/health remains public for Coolify health checks.

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

src/index.js

@@ -1,6 +1,7 @@
 require('dotenv').config();
 const express = require('express');
 const cors = require('cors');
+const auth = require('./middleware/auth');
 const { pool } = require('./db');
 
 const app = express();
@@ -20,8 +21,8 @@ app.get('/health', async (req, res) => {
   res.json({ status: 'ok', db });
 });
 
-// Routes
-app.use('/api', require('./routes/index'));
+// Routes — protected by Bearer token
+app.use('/api', auth, require('./routes/index'));
 
 // 404
 app.use((req, res) => {

src/middleware/auth.js

@@ -0,0 +1,12 @@
+const TOKENS = (process.env.API_TOKENS || '').split(',').map(t => t.trim()).filter(Boolean);
+
+module.exports = function auth(req, res, next) {
+  const header = req.headers['authorization'] || '';
+  const token = header.startsWith('Bearer ') ? header.slice(7) : null;
+
+  if (!token || !TOKENS.includes(token)) {
+    return res.status(401).json({ error: 'Unauthorized' });
+  }
+
+  next();
+};