fix: blackboard_routes mention_queue linkage (missed by auto-sync)

src/api/blackboard_routes.py

@@ -261,9 +261,24 @@ async def get_comments(project_id: str, task_id: str,
 @router.post("/tasks/{task_id}/comments")
 async def add_comment(project_id: str, task_id: str, body: Dict[str, Any]):
     bb = _bb(project_id)
+    mentions_raw = body.get("mentions")
     cid = bb.add_comment(task_id, body["author"], body["body"],
                           comment_type=body.get("comment_type", "general"),
-                          mentions=body.get("mentions"))
+                          mentions=mentions_raw)
+    # v2.9 #01: 写入 mention_queue
+    if mentions_raw:
+        if isinstance(mentions_raw, str):
+            import json as _json
+            try:
+                mentions_list = _json.loads(mentions_raw)
+            except Exception:
+                mentions_list = []
+        elif isinstance(mentions_raw, list):
+            mentions_list = mentions_raw
+        else:
+            mentions_list = []
+        if mentions_list:
+            bb.record_mentions(cid, task_id, mentions_list)
     return {"ok": True, "comment_id": cid}