feat: squash merge all changes from develop-0.1.75

Squash of 124 commits from the legacy develop branch (develop-0.1.75)
onto a clean v0.1.75 upstream base, to simplify future upstream merges.

Key changes included:
- Refactor scope-level rate limiting to model-level rate limiting
- Antigravity gateway service improvements (smart retry, error policy)
- Digest session store (flat cache replacing Trie-based store)
- Client disconnect detection during streaming
- Gemini messages compatibility service enhancements
- Scheduler shuffle for thundering herd prevention
- Session hash generation improvements
- Frontend customizations (WeChat service, HomeView, etc.)
- Ops monitoring scope cleanup

deploy/docker-compose.yml

@@ -47,13 +47,15 @@ services:
 
       # =======================================================================
       # Database Configuration (PostgreSQL)
+      # Default: uses local postgres container
+      # External DB: set DATABASE_HOST and DATABASE_SSLMODE in .env
       # =======================================================================
-      - DATABASE_HOST=postgres
-      - DATABASE_PORT=5432
+      - DATABASE_HOST=${DATABASE_HOST:-postgres}
+      - DATABASE_PORT=${DATABASE_PORT:-5432}
       - DATABASE_USER=${POSTGRES_USER:-sub2api}
       - DATABASE_PASSWORD=${POSTGRES_PASSWORD:?POSTGRES_PASSWORD is required}
       - DATABASE_DBNAME=${POSTGRES_DB:-sub2api}
-      - DATABASE_SSLMODE=disable
+      - DATABASE_SSLMODE=${DATABASE_SSLMODE:-disable}
 
       # =======================================================================
       # Redis Configuration
@@ -128,8 +130,6 @@ services:
       # Examples: http://host:port, socks5://host:port
       - UPDATE_PROXY_URL=${UPDATE_PROXY_URL:-}
     depends_on:
-      postgres:
-        condition: service_healthy
       redis:
         condition: service_healthy
     networks:
@@ -141,35 +141,6 @@ services:
       retries: 3
       start_period: 30s
 
-  # ===========================================================================
-  # PostgreSQL Database
-  # ===========================================================================
-  postgres:
-    image: postgres:18-alpine
-    container_name: sub2api-postgres
-    restart: unless-stopped
-    ulimits:
-      nofile:
-        soft: 100000
-        hard: 100000
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
-    environment:
-      - POSTGRES_USER=${POSTGRES_USER:-sub2api}
-      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD:?POSTGRES_PASSWORD is required}
-      - POSTGRES_DB=${POSTGRES_DB:-sub2api}
-      - TZ=${TZ:-Asia/Shanghai}
-    networks:
-      - sub2api-network
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-sub2api} -d ${POSTGRES_DB:-sub2api}"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-      start_period: 10s
-    # 注意：不暴露端口到宿主机，应用通过内部网络连接
-    # 如需调试，可临时添加：ports: ["127.0.0.1:5433:5432"]
-
   # ===========================================================================
   # Redis Cache
   # ===========================================================================
@@ -209,8 +180,6 @@ services:
 volumes:
   sub2api_data:
     driver: local
-  postgres_data:
-    driver: local
   redis_data:
     driver: local