feat: switch to Docker Compose + auto-migration

- docker-compose.yml: 移除 MySQL 容器，后端连宿主机 MySQL
- main.ts: 启动时自动 runMigrations
- 前端 Nginx 反代 /api/ → backend:3000 不变

apps/server/src/main.ts

@@ -1,12 +1,15 @@
 import { NestFactory } from '@nestjs/core';
 import { ValidationPipe } from '@nestjs/common';
 import { AppModule } from './app.module';
+import { DataSource } from 'typeorm';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
   app.setGlobalPrefix('api');
   app.enableCors();
-  app.useGlobalPipes(new ValidationPipe({ transform: true, whitelist: true }));
+  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}`);
 }

docker-compose.yml

@@ -1,46 +1,25 @@
 version: '3.8'
 
 services:
-  mysql:
-    image: mysql:8.0
-    container_name: gongxue_mysql
-    restart: always
-    environment:
-      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:-gongxue_2024}
-      MYSQL_DATABASE: dorm_billing_v2
-      MYSQL_CHARSET: utf8mb4
-      MYSQL_COLLATION: utf8mb4_unicode_ci
-    ports:
-      - "127.0.0.1:3306:3306"
-    volumes:
-      - mysql_data:/var/lib/mysql
-      - ./docker/mysql/init.sql:/docker-entrypoint-initdb.d/01-init.sql:ro
-    command: --default-authentication-plugin=mysql_native_password --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
-    healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
-      interval: 5s
-      retries: 10
-
   backend:
     build:
       context: .
       dockerfile: apps/server/Dockerfile
     container_name: gongxue_backend
     restart: always
+    ports:
+      - "127.0.0.1:3000:3000"
     environment:
       DB_TYPE: mysql
-      DB_HOST: mysql
+      DB_HOST: host.docker.internal
       DB_PORT: 3306
-      DB_USERNAME: root
-      DB_PASSWORD: ${MYSQL_ROOT_PASSWORD:-gongxue_2024}
-      DB_DATABASE: dorm_billing_v2
+      DB_USERNAME: ${MYSQL_ROOT_USERNAME:-root}
+      DB_PASSWORD: ${MYSQL_ROOT_PASSWORD}
+      DB_DATABASE: ${DB_DATABASE:-dorm_billing_v2}
       DB_SYNCHRONIZE: "false"
       JWT_SECRET: ${JWT_SECRET:-gongxue-jwt-prod-2026-k3y}
       JWT_EXPIRES_IN: 24h
       PORT: 3000
-    depends_on:
-      mysql:
-        condition: service_healthy
 
   frontend:
     build:
@@ -49,9 +28,6 @@ services:
     container_name: gongxue_frontend
     restart: always
     ports:
-      - "9527:80"
+      - "127.0.0.1:9527:80"
     depends_on:
       - backend
-
-volumes:
-  mysql_data: