feat(postgres): add postgres backend support and migration docs

docker-compose-v4.yml

@@ -8,7 +8,9 @@ services:
       options:
         max-size: "20m"
     environment:
+      DB_TYPE: ${DB_TYPE:-sqlite}
       DB_PATH: /app/data/gost.db
+      DATABASE_URL: ${DATABASE_URL:-}
       JWT_SECRET: ${JWT_SECRET}
       LOG_DIR: /app/logs
       SERVER_ADDR: :6365
@@ -29,6 +31,30 @@ services:
       retries: 5
       start_period: 30s
 
+  postgres:
+    image: postgres:16-alpine
+    container_name: flux-panel-postgres
+    restart: unless-stopped
+    logging:
+      driver: json-file
+      options:
+        max-size: "20m"
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-flux_panel}
+      POSTGRES_USER: ${POSTGRES_USER:-flux_panel}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-flux_panel_change_me}
+      TZ: Asia/Shanghai
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    networks:
+      - gost-network
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-flux_panel} -d ${POSTGRES_DB:-flux_panel}"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+      start_period: 20s
+
   frontend:
     image: ghcr.io/sagit-chu/vite-frontend:${FLUX_VERSION:-latest}
     container_name: vite-frontend
@@ -50,6 +76,9 @@ volumes:
   sqlite_data:
     name: sqlite_data
     driver: local
+  postgres_data:
+    name: postgres_data
+    driver: local
   backend_logs:
     name: backend_logs
     driver: local