fix(server): keep done/finish_reason on combined tool_call+done SSE chunk

The streaming SSE consumer short-circuited with  after emitting a
tool_call delta, so a publisher that carries done + finish_reason in the same
chunk as its final tool_call delta had them silently dropped: finish_reason
came out as "stop" and auto-resolve mode never fired the capability. Fall
through to the done check instead, matching the separate-chunk path.

Author: Zawwarsami16

zhub/server.py

@@ -1760,7 +1760,9 @@ async def event_stream():
                                              "finish_reason": None}],
                             }
                             yield f"data: {json.dumps(sse)}\n\n"
-                            continue
+                            # fall through: a publisher may carry done/finish_reason
+                            # in the same chunk as its final tool_call delta, so the
+                            # done check below must still run.
                         if text:
                             sse = {
                                 "id": completion_id,