updated plugin refactor and added FTP and SCP plugins , also hydrusnetwork plugin migration

Store/HydrusNetwork.py

@@ -89,6 +89,8 @@ class HydrusNetwork(Store):
     Maintains its own HydrusClient.
     """
 
+    STORE_TYPE = "hydrusnetwork"
+
     @classmethod
     def config_schema(cls) -> List[Dict[str, Any]]:
         return [
@@ -1776,6 +1778,33 @@ class HydrusNetwork(Store):
             debug(f"{self._log_prefix()} delete_file failed: {exc}")
             return False
 
+    def build_file_url(self, file_hash: str, *, include_access_key: bool = True) -> str:
+        normalized = str(file_hash or "").strip().lower()
+        base_url = str(self.URL).rstrip("/")
+        url = f"{base_url}/get_files/file?hash={quote(normalized)}"
+        if include_access_key and str(self.API or "").strip():
+            url = f"{url}&Hydrus-Client-API-Access-Key={quote(str(self.API))}"
+        return url
+
+    def fetch_file_metadata(self, file_hash: str, **kwargs: Any) -> Optional[Dict[str, Any]]:
+        try:
+            client = self._client
+            if client is None:
+                return None
+            return client.fetch_file_metadata(hashes=[str(file_hash or "").strip().lower()], **kwargs)
+        except Exception:
+            return None
+
+    def get_relationships(self, file_hash: str) -> Optional[Dict[str, Any]]:
+        try:
+            client = self._client
+            if client is None:
+                return None
+            payload = client.get_file_relationships(str(file_hash or "").strip().lower())
+            return payload if isinstance(payload, dict) else None
+        except Exception:
+            return None
+
     def get_metadata(self, file_hash: str, **kwargs: Any) -> Optional[Dict[str, Any]]:
         """Get metadata for a file from Hydrus by hash.