Fix Gitea issue label payloads

issue_core/backends/gitea/backend.py

@@ -195,10 +195,20 @@ class GiteaBackend(RemoteBackend, SyncableBackend):
         if issue.milestone:
             data['milestone'] = int(issue.milestone.backend_id) if issue.milestone.backend_id else None
 
-        # Convert labels
-        if issue.labels:
-            data['labels'] = [label.name for label in issue.labels]
-
+        # Gitea expects numeric label IDs on issue create/update. Name-only
+        # labels are preserved in issue-core metadata but omitted from the API
+        # payload until a label-resolution step exists.
+        label_ids = []
+        for label in issue.labels:
+            if not label.backend_id:
+                continue
+            try:
+                label_ids.append(int(label.backend_id))
+            except (TypeError, ValueError):
+                continue
+        if label_ids:
+            data['labels'] = label_ids
+
         return data
 
     # Issue CRUD Operations