Fix architecture issues from todolist

- Add documentation warnings for in-memory rate limiting and failed login attempts
- Consolidate duplicate health endpoints into api/health.py
- Fix CLI to use correct async rescan method names
- Update download.py and anime.py to use custom exception classes
- Add WebSocket room validation and rate limiting

src/server/api/health.py

@@ -23,6 +23,9 @@ class HealthStatus(BaseModel):
     status: str
     timestamp: str
     version: str = "1.0.0"
+    service: str = "aniworld-api"
+    series_app_initialized: bool = False
+    anime_directory_configured: bool = False
 
 
 class DatabaseHealth(BaseModel):
@@ -170,14 +173,24 @@ def get_system_metrics() -> SystemMetrics:
 @router.get("", response_model=HealthStatus)
 async def basic_health_check() -> HealthStatus:
     """Basic health check endpoint.
+    
+    This endpoint does not depend on anime_directory configuration
+    and should always return 200 OK for basic health monitoring.
+    Includes service information for identification.
 
     Returns:
-        HealthStatus: Simple health status with timestamp.
+        HealthStatus: Simple health status with timestamp and service info.
     """
+    from src.config.settings import settings
+    from src.server.utils.dependencies import _series_app
+    
     logger.debug("Basic health check requested")
     return HealthStatus(
         status="healthy",
         timestamp=datetime.now().isoformat(),
+        service="aniworld-api",
+        series_app_initialized=_series_app is not None,
+        anime_directory_configured=bool(settings.anime_directory),
     )