feat: Docker Compose deployment + auto migration on startup

- docker-compose.yml: 移除 MySQL 容器，连宿主机 MySQL
- main.ts: 启动前通过独立 DataSource 执行 runMigrations
- migration-runner.ts: 独立 migration 执行器
- app.module.ts: TypeORM 配置增加 migrations
- 修复 InitialSchema 中 room_expenses 和 financial_operations 重复索引

apps/server/src/main.ts

@@ -1,15 +1,14 @@
 import { NestFactory } from '@nestjs/core';
 import { ValidationPipe } from '@nestjs/common';
 import { AppModule } from './app.module';
-import { DataSource } from 'typeorm';
+import { runMigrationsOnStartup } from './migration-runner';
 
 async function bootstrap() {
+  await runMigrationsOnStartup();
+
   const app = await NestFactory.create(AppModule);
   app.setGlobalPrefix('api');
   app.enableCors();
-  const dataSource = app.get(DataSource);
-  await dataSource.runMigrations();
-  console.log('Migrations OK');
   await app.listen(process.env.PORT ?? 3000);
   console.log(`Server running on http://localhost:${process.env.PORT ?? 3000}`);
 }