feat(agent): control reasoning visibility

ai_knowledge_base_v2/apps/user-client/src/App.vue

@@ -150,9 +150,16 @@ async function send(message: string, complete: (success: boolean) => void) {
         currentAssistant().content += chunk;
         if (followingOutput.value) await messageList.value?.scrollToBottom();
       },
-      async (statusMessage, statusType) => {
+      async (chunk) => {
+        currentAssistant().reasoning = (currentAssistant().reasoning || "") + chunk;
+        if (followingOutput.value) await messageList.value?.scrollToBottom();
+      },
+      async (statusMessage, statusType, reasoningVisible) => {
         if (statusType === "queued") currentAssistant().content = statusMessage || "当前请求较多，正在排队中。";
-        if (statusType === "generating" && !hasContent) currentAssistant().content = "";
+        if (statusType === "generating") {
+          currentAssistant().showReasoning = reasoningVisible;
+          if (!hasContent) currentAssistant().content = "";
+        }
         if (followingOutput.value) await messageList.value?.scrollToBottom();
       },
       activeAbortController.value.signal,
@@ -256,6 +263,7 @@ function toUiMessage(message: ApiMessage): DisplayMessage {
     id: String(message.id),
     role: message.role,
     content: message.content,
+    showReasoning: message.role === "assistant" && /<think(?:\s[^>]*)?>/i.test(message.content),
     createdAt: message.created_at,
     streaming: message.message_status === "GENERATING",
   };