implement auth login and register with MongoDB

- Add AuthController login/register endpoints with error handling
- Implement AuthService with password validation and user creation
- Add MongoUserRepository with findByEmail and create methods
- Implement password hashing with bcrypt
- Add dotenv for environment variable support
- Add Docker Compose setup for MongoDB + Mongo Express
- Stub AuthMiddleware with fake user for testing
- Update CLAUDE.md with implementation status

apps/server/src/controllers/AuthController.ts

@@ -5,11 +5,21 @@ export class AuthController {
   constructor(private authService: AuthService) {}
 
   async login(req: Request, res: Response): Promise<void> {
-    throw new Error('Not implemented');
+    try {
+      const result = await this.authService.login(req.body);
+      res.json(result);
+    } catch (error) {
+      res.status(401).json({ error: (error as Error).message });
+    }
   }
 
   async register(req: Request, res: Response): Promise<void> {
-    throw new Error('Not implemented');
+    try {
+      const result = await this.authService.register(req.body);
+      res.status(201).json(result);
+    } catch (error) {
+      res.status(400).json({ error: (error as Error).message });
+    }
   }
 
   async refresh(req: Request, res: Response): Promise<void> {