fix: provider selection for updating webchat title

astrbot/core/pipeline/process_stage/method/llm_request.py

@@ -254,11 +254,11 @@ class LLMRequestSubStage(Stage):
 
         # 异步处理 WebChat 特殊情况
         if event.get_platform_name() == "webchat":
-            asyncio.create_task(self._handle_webchat(event, req))
+            asyncio.create_task(self._handle_webchat(event, req, provider))
 
         await self._save_to_history(event, req, tool_loop_agent.get_final_llm_resp())
 
-    async def _handle_webchat(self, event: AstrMessageEvent, req: ProviderRequest):
+    async def _handle_webchat(self, event: AstrMessageEvent, req: ProviderRequest, prov: Provider):
         """处理 WebChat 平台的特殊情况，包括第一次 LLM 对话时总结对话内容生成 title"""
         conversation = await self.conv_manager.get_conversation(
             event.unified_msg_origin, req.conversation.cid
@@ -268,10 +268,9 @@ class LLMRequestSubStage(Stage):
             latest_pair = messages[-2:]
             if not latest_pair:
                 return
-            provider = self.ctx.plugin_manager.context.get_using_provider()
             cleaned_text = "User: " + latest_pair[0].get("content", "").strip()
             logger.debug(f"WebChat 对话标题生成请求，清理后的文本: {cleaned_text}")
-            llm_resp = await provider.text_chat(
+            llm_resp = await prov.text_chat(
                 system_prompt="You are expert in summarizing user's query.",
                 prompt=(
                     f"Please summarize the following query of user:\n"