fix: normalize nested activity metadata (#95)

src/gitea_proxy.py

@@ -42,10 +42,26 @@ async def activity_events() -> list[dict]:
     events = await fetch(f"users/{user['login']}/activities/feeds?limit=20")
     return [
         {
-            "type": event.get("op_type", "activity"),
-            "actor": event.get("act_user") or {},
-            "repo": event.get("repo") or {},
-            "created_at": event.get("created", ""),
+            "type": (
+                event.get("op_type")
+                if isinstance(event.get("op_type"), str) and event.get("op_type")
+                else "activity"
+            ),
+            "actor": (
+                event.get("act_user")
+                if isinstance(event.get("act_user"), dict)
+                else {}
+            ),
+            "repo": (
+                event.get("repo")
+                if isinstance(event.get("repo"), dict)
+                else {}
+            ),
+            "created_at": (
+                event.get("created")
+                if isinstance(event.get("created"), str)
+                else ""
+            ),
         }
         for event in (events or [])
         if isinstance(event, dict)