fix: move service_signatures.json inside app package and bump to 1.3.3

The file was in /app/data/ which gets overwritten by the Docker volume
mount (backend_data:/app/data), making it invisible at runtime and
causing scan failures on fresh installs. Moved to /app/app/data/ so
it stays baked into the image.

backend/app/services/fingerprint.py

@@ -10,7 +10,7 @@ _SIGNATURES: list[dict[str, Any]] | None = None
 def _load() -> list[dict[str, Any]]:
     global _SIGNATURES
     if _SIGNATURES is None:
-        path = Path(__file__).parent.parent.parent / "data" / "service_signatures.json"
+        path = Path(__file__).parent.parent / "data" / "service_signatures.json"
         with open(path) as f:
             _SIGNATURES = json.load(f)
     return _SIGNATURES