feat: 更新后端平台模块、数据库、Compute引擎及多项配置文档

- 更新 backend 平台 API、platform_store、session 数据库模块
- 新增 backend SQL 初始化脚本
- 更新 compute 引擎适配器及 README
- 更新 Docker 部署配置（app/compute）
- 更新前端入口、环境类型声明及 README
- 新增 docs/menu-functional-requirements.md 菜单功能需求文档
- 更新多项项目文档

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

backend/app/core/config.py

@@ -16,8 +16,8 @@ class Settings:
     app_env: str = os.getenv("APP_ENV", "local")
     route_prefix: str = os.getenv("MODELTF_ROUTE_PREFIX", "/modelTF")
     app_mode: str = os.getenv("APP_MODE", "local")
-    local_db_path: str = os.getenv("LOCAL_DB_PATH", "./runtime/platform.db")
-    compute_mode: str = os.getenv("COMPUTE_MODE", "simulator")
+    database_url: str = os.getenv("DATABASE_URL", "postgresql+psycopg://yg_ft:change_me@localhost:15432/yg_ft")
+    compute_mode: str = os.getenv("COMPUTE_MODE", "real")
     compute_status_sync_mode: str = os.getenv("COMPUTE_STATUS_SYNC_MODE", "polling")
     compute_poll_interval_seconds: int = _int_env("COMPUTE_POLL_INTERVAL_SECONDS", 3)
     log_level: str = os.getenv("LOG_LEVEL", "INFO")