feat(backend): 添加服务管理脚本并配置应用基础参数

- 更新 .gitignore 忽略后端日志目录和 PID 文件
- 新增 app_name 配置项并替换主程序中硬编码的应用名称
- 为配置模型添加 extra: ignore 以兼容额外环境变量
- 新增完整的后端服务管理脚本 serv.sh，支持常用管理操作

backend/app/config.py

@@ -2,6 +2,8 @@ from pydantic_settings import BaseSettings
 
 
 class Settings(BaseSettings):
+    app_name: str = "孕育无忧"
+
     # Path Prefix
     api_prefix: str = "/api"
     uploads_prefix: str = "/uploads"
@@ -37,7 +39,7 @@ class Settings(BaseSettings):
     port: int = 8000
     debug: bool = True
 
-    model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}
+    model_config = {"env_file": ".env", "env_file_encoding": "utf-8", "extra": "ignore"}
 
 
 settings = Settings()

backend/app/main.py

@@ -28,7 +28,7 @@ logging.basicConfig(
     format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
     datefmt="%Y-%m-%d %H:%M:%S",
 )
-logger = logging.getLogger("孕育无忧")
+logger = logging.getLogger(settings.app_name)
 
 
 @asynccontextmanager
@@ -42,7 +42,7 @@ async def lifespan(app: FastAPI):
 
 
 app = FastAPI(
-    title="孕育无忧 API",
+    title=f"{settings.app_name} API",
     description="孕期健康检查报告解读后端服务",
     version="1.0.0",
     lifespan=lifespan,
@@ -111,7 +111,7 @@ app.include_router(share.router, prefix=f"{api_prefix}/share", tags=["分享"])
 
 @app.get(f"{api_prefix}/health")
 async def health_check():
-    return {"status": "ok", "service": "孕育无忧 API"}
+    return {"status": "ok", "service": f"{settings.app_name} API"}
 
 
 @app.get("/")