fix: list_collections 异常向上传播而非静默吞掉

src/server/deps.py

@@ -54,11 +54,8 @@ class AppState:
     def list_collections_with_stats(self) -> list[dict]:
         """列出所有 collection 及其统计（直接从 ChromaDB 查询）."""
         result = []
-        try:
-            for coll in self.db.list_collections():
-                result.append({"name": coll.name, "count": coll.count()})
-        except Exception:
-            logger.exception("列出集合失败")
+        for coll in self.db.list_collections():
+            result.append({"name": coll.name, "count": coll.count()})
         return result
 
     def is_healthy(self) -> dict: