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

tests/unit/test_health.py

@@ -18,12 +18,18 @@ from src.server.api.health import (
 @pytest.mark.asyncio
 async def test_basic_health_check():
     """Test basic health check endpoint."""
-    result = await basic_health_check()
+    with patch("src.config.settings.settings") as mock_settings, \
+         patch("src.server.utils.dependencies._series_app", None):
+        mock_settings.anime_directory = ""
+        result = await basic_health_check()
 
-    assert isinstance(result, HealthStatus)
-    assert result.status == "healthy"
-    assert result.version == "1.0.0"
-    assert result.timestamp is not None
+        assert isinstance(result, HealthStatus)
+        assert result.status == "healthy"
+        assert result.version == "1.0.0"
+        assert result.service == "aniworld-api"
+        assert result.timestamp is not None
+        assert result.series_app_initialized is False
+        assert result.anime_directory_configured is False
 
 
 @pytest.mark.asyncio