feat: add update service dependency and has_update filter

- Pass ModelUpdateService to CheckpointService, EmbeddingService, and LoraService constructors
- Add has_update query parameter filter to model listing handler
- Update BaseModelService to accept optional update_service parameter

These changes enable model update functionality across different model types and provide filtering capability for models with available updates.

py/services/checkpoint_service.py

@@ -11,13 +11,14 @@ logger = logging.getLogger(__name__)
 class CheckpointService(BaseModelService):
     """Checkpoint-specific service implementation"""
     
-    def __init__(self, scanner):
+    def __init__(self, scanner, update_service=None):
         """Initialize Checkpoint service
         
         Args:
             scanner: Checkpoint scanner instance
+            update_service: Optional service for remote update tracking.
         """
-        super().__init__("checkpoint", scanner, CheckpointMetadata)
+        super().__init__("checkpoint", scanner, CheckpointMetadata, update_service=update_service)
     
     async def format_response(self, checkpoint_data: Dict) -> Dict:
         """Format Checkpoint data for API response"""
@@ -46,4 +47,4 @@ class CheckpointService(BaseModelService):
     
     def find_duplicate_filenames(self) -> Dict:
         """Find Checkpoints with conflicting filenames"""
-        return self.scanner._hash_index.get_duplicate_filenames()
+        return self.scanner._hash_index.get_duplicate_filenames()