feat: 视频创作流程全链路优化

- 后端: Vidu Provider、System API、Upload API、素材服务更新
- 前端: 字幕压制、视频生成、配音、本地存储、类型定义优化
- Rust: FFmpeg 命令、视频合成、语音命令、库注册更新
- Store: 项目状态、语音状态管理优化
- 新增: 对口型替换文档、健康检查器、字幕 API 模块、音频对齐工具
- 删除: 废弃的 polish 提示词模板

python-api/app/api/v1/system.py

@@ -3,8 +3,10 @@
 ============
 """
 
-from fastapi import APIRouter
+from fastapi import APIRouter, status
+from fastapi.responses import JSONResponse
 
+from app.core.health_checker import check_database, check_redis
 from app.schemas.common import ApiResponse, success_response
 
 router = APIRouter()
@@ -13,16 +15,34 @@ router = APIRouter()
 @router.get("/health", response_model=ApiResponse[dict])
 async def system_health():
     """系统健康检查（详细版）"""
-    return success_response(
-        data={
-            "status": "healthy",
-            "services": {
-                "api": "up",
-                "database": "unknown",  # TODO: 检查数据库连接
-                "redis": "unknown",  # TODO: 检查 Redis 连接
+    db_ok, db_msg = await check_database()
+    redis_ok, redis_msg = await check_redis()
+
+    services = {
+        "api": "up",
+        "database": "connected" if db_ok else db_msg,
+        "redis": "connected" if redis_ok else redis_msg,
+    }
+
+    if not db_ok:
+        return JSONResponse(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            content={
+                "code": status.HTTP_503_SERVICE_UNAVAILABLE,
+                "message": "数据库连接异常",
+                "data": {"status": "unhealthy", "services": services},
             },
-        },
+        )
+
+    if not redis_ok:
+        return success_response(
+            message="Redis 连接异常，服务降级",
+            data={"status": "degraded", "services": services},
+        )
+
+    return success_response(
         message="系统运行正常",
+        data={"status": "healthy", "services": services},
     )