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/utils/password.ts

@@ -3,9 +3,9 @@ import bcrypt from 'bcrypt';
 const SALT_ROUNDS = 10;
 
 export async function hash(password: string): Promise<string> {
-  throw new Error('Not implemented');
+  return bcrypt.hash(password, SALT_ROUNDS);
 }
 
 export async function compare(password: string, hash: string): Promise<boolean> {
-  throw new Error('Not implemented');
+  return bcrypt.compare(password, hash);
 }