implement backend skeleton with MongoDB and Claude AI integration

- Add controllers (Auth, Chat, Event) with placeholder implementations
- Add services (Auth, Chat, Event) with business logic interfaces
- Add repositories with MongoDB/Mongoose models (User, Event, Chat)
- Add middleware for JWT authentication
- Add Claude AI adapter implementing AIProvider interface
- Add utility modules for JWT and password handling
- Add shared types and DTOs for User, CalendarEvent, ChatMessage
- Configure routes with proper endpoint structure
- Update app.ts with dependency injection setup
- Add required dependencies: mongoose, bcrypt, jsonwebtoken, @anthropic-ai/sdk

apps/server/src/app.ts

@@ -1,12 +1,64 @@
-import express, { Request, Response } from 'express';
+import express from 'express';
+import mongoose from 'mongoose';
+
+import { createRoutes } from './routes';
+import { AuthController, ChatController, EventController } from './controllers';
+import { AuthService, ChatService, EventService } from './services';
+import { MongoUserRepository, MongoEventRepository, MongoChatRepository } from './repositories';
+import { ClaudeAdapter } from './ai';
 
 const app = express();
-const port = 3000;
+const port = process.env.PORT || 3000;
+const mongoUri = process.env.MONGODB_URI || 'mongodb://localhost:27017/caldav';
 
-app.get('/', (req: Request, res: Response) => {
-  res.send('Hello World!');
+// Middleware
+app.use(express.json());
+
+// Initialize repositories
+const userRepo = new MongoUserRepository();
+const eventRepo = new MongoEventRepository();
+const chatRepo = new MongoChatRepository();
+
+// Initialize AI provider
+const aiProvider = new ClaudeAdapter();
+
+// Initialize services
+const authService = new AuthService(userRepo);
+const chatService = new ChatService(chatRepo, eventRepo, aiProvider);
+const eventService = new EventService(eventRepo);
+
+// Initialize controllers
+const authController = new AuthController(authService);
+const chatController = new ChatController(chatService);
+const eventController = new EventController(eventService);
+
+// Setup routes
+app.use('/api', createRoutes({
+  authController,
+  chatController,
+  eventController,
+}));
+
+// Health check
+app.get('/health', (_, res) => {
+  res.json({ status: 'ok' });
 });
 
-app.listen(port, () => {
-  console.log(`Example app listening on port ${port}`);
-});
+// Start server
+async function start() {
+  try {
+    await mongoose.connect(mongoUri);
+    console.log('Connected to MongoDB');
+
+    app.listen(port, () => {
+      console.log(`Server running on port ${port}`);
+    });
+  } catch (error) {
+    console.error('Failed to start server:', error);
+    process.exit(1);
+  }
+}
+
+start();
+
+export default app;