refactor(ai): AI助手优化和移除MCP插件

src/App.vue

@@ -20,6 +20,7 @@ import { useAppStore, useSettingsStore } from "@/store";
 import { defaultSettings } from "@/settings";
 import { ThemeMode, ComponentSize } from "@/enums";
 import AiAssistant from "@/components/AiAssistant/index.vue";
+import { AuthStorage } from "@/utils/auth";
 
 const appStore = useAppStore();
 const settingsStore = useSettingsStore();
@@ -27,7 +28,13 @@ const settingsStore = useSettingsStore();
 const locale = computed(() => appStore.locale);
 const size = computed(() => appStore.size as ComponentSize);
 const showWatermark = computed(() => settingsStore.showWatermark);
-const enableAiAssistant = computed(() => settingsStore.enableAiAssistant);
+
+// 只有在启用 AI 助手且用户已登录时才显示
+const enableAiAssistant = computed(() => {
+  const isEnabled = settingsStore.enableAiAssistant;
+  const isLoggedIn = !!AuthStorage.getAccessToken();
+  return isEnabled && isLoggedIn;
+});
 
 // 明亮/暗黑主题水印字体颜色适配
 const fontColor = computed(() => {