fix: speed up chat detail pagination

ai_knowledge_base_v2/apps/admin-web/src/App.vue

@@ -53,6 +53,7 @@ const previewKnowledgeId = ref<number | null>(null);
 const chatDetail = ref<ChatDetail | null>(null);
 const chatDetailOpen = ref(false);
 const chatDetailLoading = ref(false);
+const chatMessagesLoading = ref(false);
 const chatDetailSessionId = ref<number | null>(null);
 const selectedAiLog = ref<AiLogRecord | null>(null);
 const aiLogDetailOpen = ref(false);
@@ -773,7 +774,21 @@ async function loadChatDetail(sessionId = chatDetailSessionId.value, page = chat
 }
 
 async function changeChatDetailMessagePage(page: number, pageSize: number) {
-  await loadChatDetail(chatDetailSessionId.value, page, pageSize);
+  if (!chatDetailSessionId.value || !chatDetail.value) return;
+  chatMessagesLoading.value = true;
+  try {
+    const result = await api.chatMessages(chatDetailSessionId.value, { page, pageSize });
+    chatDetail.value = {
+      ...chatDetail.value,
+      messages: result.items,
+      messagesPage: result,
+    };
+    Object.assign(chatDetailMessagePager, { page: result.page, pageSize: result.pageSize, total: result.total });
+  } catch (error) {
+    ElMessage.error(error instanceof Error ? error.message : "聊天消息加载失败");
+  } finally {
+    chatMessagesLoading.value = false;
+  }
 }
 
 async function openAiLogDetail(row: AiLogRecord) {
@@ -1244,7 +1259,7 @@ function formatRecordDateTime(value: string, boundary: "start" | "end") {
         </section>
 
         <h3 class="detail-title">完整对话</h3>
-        <section class="conversation-list">
+        <section v-loading="chatMessagesLoading" class="conversation-list">
           <article
             v-for="message in chatDetail.messages"
             :key="message.id"