chore(deploy): 本地开发连接远程开发服务器数据库

- 去掉本地 MySQL 容器，直接连 8.148.151.56:3306
- 关闭 Flyway 自动迁移（SPRING_FLYWAY_ENABLED=false），防止本地误跑

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -1,23 +1,6 @@
 version: '3.8'
 
 services:
-  mysql:
-    image: mysql:8.0
-    container_name: kg-mysql
-    restart: unless-stopped
-    environment:
-      MYSQL_ROOT_PASSWORD: reading_platform_pwd
-      MYSQL_DATABASE: reading_platform
-    volumes:
-      - mysql_data:/var/lib/mysql
-    ports:
-      - "3306:3306"
-    healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-
   backend:
     build:
       context: ./reading-platform-java
@@ -27,12 +10,13 @@ services:
       - "8080:8080"
     environment:
       - SPRING_PROFILES_ACTIVE=prod
+      - SPRING_DATASOURCE_URL=jdbc:mysql://8.148.151.56:3306/reading_platform?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
+      - SPRING_DATASOURCE_USERNAME=root
+      - SPRING_DATASOURCE_PASSWORD=reading_platform_pwd
+      - SPRING_FLYWAY_ENABLED=false
       - JWT_SECRET=${JWT_SECRET:-reading-platform-jwt-secret-key-must-be-at-least-256-bits-long}
     volumes:
       - uploads_data:/app/uploads
-    depends_on:
-      mysql:
-        condition: service_healthy
 
   frontend:
     build:
@@ -45,5 +29,4 @@ services:
       - backend
 
 volumes:
-  mysql_data:
   uploads_data: