feat: Replace Meetings with Calendar - events with types and assigned users

- Rename meetings table to events with type field (meeting/event)
- Add eventUsers junction table for user assignments
- Members see only events they're assigned to
- Calendar endpoint returns events + todos for month
- Add migration SQL for database changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/app.js

@@ -25,7 +25,7 @@ import todoRoutes from './routes/todo.routes.js';
 import timeTrackingRoutes from './routes/time-tracking.routes.js';
 import noteRoutes from './routes/note.routes.js';
 import auditRoutes from './routes/audit.routes.js';
-import meetingRoutes from './routes/meeting.routes.js';
+import eventRoutes from './routes/event.routes.js';
 
 const app = express();
 
@@ -89,7 +89,7 @@ app.use('/api/todos', todoRoutes);
 app.use('/api/time-tracking', timeTrackingRoutes);
 app.use('/api/notes', noteRoutes);
 app.use('/api/audit-logs', auditRoutes);
-app.use('/api/meetings', meetingRoutes);
+app.use('/api/events', eventRoutes);
 
 // Basic route
 app.get('/', (req, res) => {