fix: 添加 PostgreSQL 服务到 Docker Compose，修复数据库连接问题

docker-compose.yml

@@ -1,6 +1,27 @@
 version: '3.8'
 
 services:
+  # PostgreSQL 数据库
+  scoring-db:
+    image: postgres:15-alpine
+    container_name: cywl-scoring-db
+    restart: always
+    environment:
+      - POSTGRES_DB=scoring_system
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+    volumes:
+      - scoring_db_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    networks:
+      - scoring_network
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
   # 后端服务
   scoring-backend:
     build:
@@ -16,11 +37,11 @@ services:
     environment:
       - DEBUG=False
       - SECRET_KEY=${SECRET_KEY:-your-secret-key-change-this}
-      - DB_NAME=${DB_NAME:-scoring_system}
-      - DB_USER=${DB_USER:-postgres}
-      - DB_PASSWORD=${DB_PASSWORD:-password}
-      - DB_HOST=${DB_HOST:-localhost}
-      - DB_PORT=${DB_PORT:-5432}
+      - DB_NAME=scoring_system
+      - DB_USER=postgres
+      - DB_PASSWORD=password
+      - DB_HOST=scoring-db
+      - DB_PORT=5432
       - WECHAT_APPID=${WECHAT_APPID}
       - WECHAT_SECRET=${WECHAT_SECRET}
       - WECHAT_MCHID=${WECHAT_MCHID}
@@ -31,6 +52,9 @@ services:
       - ALIYUN_OSS_BUCKET_NAME=${ALIYUN_OSS_BUCKET_NAME}
       - ALIYUN_TINGWU_APP_KEY=${ALIYUN_TINGWU_APP_KEY}
       - DASHSCOPE_API_KEY=${DASHSCOPE_API_KEY}
+    depends_on:
+      scoring-db:
+        condition: service_healthy
     networks:
       - scoring_network
     healthcheck:
@@ -54,6 +78,9 @@ services:
     depends_on:
       scoring-backend:
         condition: service_healthy
+
+volumes:
+  scoring_db_data:
     networks:
       - scoring_network
     healthcheck: