🌊 TeamFlow — Modern Trello alternative with email integration

- Full-stack: React 18 + Express + SQLite
- Drag-and-drop kanban boards with @hello-pangea/dnd
- Google App Password email integration (SMTP + IMAP)
- Inbound email: create cards by sending emails
- Reply-to-card: email replies become comments
- Admin/user management with role-based access
- Setup wizard: email config → admin creation
- Checklists, time tracking, priorities, labels, due dates
- Real-time notifications with activity feed
- Beautiful HTML email templates

server/middleware/auth.js

@@ -0,0 +1,34 @@
+import jwt from 'jsonwebtoken';
+import db from '../db.js';
+
+const JWT_SECRET = process.env.JWT_SECRET || 'teamflow-secret-change-in-production';
+
+export function generateToken(user) {
+  return jwt.sign(
+    { id: user.id, email: user.email, role: user.role },
+    JWT_SECRET,
+    { expiresIn: '7d' }
+  );
+}
+
+export function authMiddleware(req, res, next) {
+  const header = req.headers.authorization;
+  if (!header || !header.startsWith('Bearer ')) {
+    return res.status(401).json({ error: 'No token provided' });
+  }
+  try {
+    const token = header.split(' ')[1];
+    const payload = jwt.verify(token, JWT_SECRET);
+    const user = db.prepare('SELECT id, email, name, avatar_color, role, is_active FROM users WHERE id = ?').get(payload.id);
+    if (!user || !user.is_active) return res.status(401).json({ error: 'Invalid token' });
+    req.user = user;
+    next();
+  } catch {
+    return res.status(401).json({ error: 'Invalid token' });
+  }
+}
+
+export function adminOnly(req, res, next) {
+  if (req.user.role !== 'admin') return res.status(403).json({ error: 'Admin access required' });
+  next();
+}