feat(mam-api): add auth middleware with session and Bearer token support

services/mam-api/src/middleware/auth.js

@@ -2,17 +2,62 @@
  * Authentication middleware.
  *
  * When AUTH_ENABLED=true in the environment, every protected route requires
- * an active session (set by POST /api/v1/auth/login).
+ * either:
+ *   - An active session (set by POST /api/v1/auth/login), or
+ *   - A valid Bearer token in Authorization header (set by POST /api/v1/tokens)
  *
- * When AUTH_ENABLED is unset or any other value, the middleware is a no-op
- * so the stack can be deployed and tested without setting up users first.
- * Set AUTH_ENABLED=true in production after running POST /api/v1/auth/setup
- * to create the first admin account.
+ * When AUTH_ENABLED is unset or any other value, all middleware is a no-op so
+ * the stack can be run without user accounts during development.
  */
-export const requireAuth = (req, res, next) => {
+import crypto from 'crypto';
+import pool   from '../db/pool.js';
+
+export const requireAuth = async (req, res, next) => {
   if (process.env.AUTH_ENABLED !== 'true') return next();
-  if (!req.session || !req.session.userId) {
-    return res.status(401).json({ error: 'Unauthorized' });
+
+  // ── Session-based auth ────────────────────────────────────────
+  if (req.session?.userId) {
+    req.user = {
+      id:       req.session.userId,
+      username: req.session.username,
+      role:     req.session.role,
+    };
+    return next();
   }
-  next();
+
+  // ── Bearer token auth ─────────────────────────────────────────
+  const authHeader = req.headers.authorization;
+  if (authHeader?.startsWith('Bearer ')) {
+    const raw  = authHeader.slice(7).trim();
+    const hash = crypto.createHash('sha256').update(raw).digest('hex');
+    try {
+      const { rows } = await pool.query(
+        `SELECT t.user_id AS id, u.username, u.role
+         FROM api_tokens t
+         JOIN users u ON u.id = t.user_id
+         WHERE t.token_hash = $1
+           AND (t.expires_at IS NULL OR t.expires_at > NOW())`,
+        [hash]
+      );
+      if (rows.length > 0) {
+        req.user = rows[0];
+        // Fire-and-forget last_used_at update
+        pool.query(
+          'UPDATE api_tokens SET last_used_at = NOW() WHERE token_hash = $1',
+          [hash]
+        ).catch(() => {});
+        return next();
+      }
+    } catch (err) {
+      return next(err);
+    }
+  }
+
+  return res.status(401).json({ error: 'Unauthorized' });
+};
+
+export const requireAdmin = (req, res, next) => {
+  if (process.env.AUTH_ENABLED !== 'true') return next();
+  if (req.user?.role === 'admin') return next();
+  return res.status(403).json({ error: 'Admin access required' });
 };