chore(ai): remove env toggle and default AI assistant to settings switch

src/App.vue

@@ -30,7 +30,7 @@ const size = computed(() => appStore.size as ComponentSize);
 const showWatermark = computed(() => settingsStore.showWatermark);
 const watermarkContent = appConfig.name;
 
-// 只有在启用 AI 助手且用户已登录时才显示
+// 只有在用户启用 AI 助手且已登录时才显示
 // 使用 userInfo 作为响应式依赖，当用户退出登录时会自动更新
 const enableAiAssistant = computed(() => {
   const isEnabled = settingsStore.enableAiAssistant;

src/layouts/components/LayoutSettings.vue

@@ -71,7 +71,7 @@
           <el-switch v-model="settingsStore.colorWeak" />
         </div>
 
-        <div v-if="aiSystemEnabled" class="config-item flex-x-between">
+        <div class="config-item flex-x-between">
           <span class="text-xs">AI 助手</span>
           <el-switch v-model="settingsStore.userEnableAi" />
         </div>
@@ -173,7 +173,7 @@ import { DocumentCopy, RefreshLeft, Check } from "@element-plus/icons-vue";
 const { t } = useI18n();
 import { LayoutMode, PageSwitchingAnimationOptions, SidebarColor, ThemeMode } from "@/enums";
 import { useSettingsStore } from "@/store";
-import { themeColorPresets, appConfig } from "@/settings";
+import { themeColorPresets } from "@/settings";
 
 // 页面切换动画选项
 const pageSwitchingAnimationOptions: Record<string, OptionItem> = PageSwitchingAnimationOptions;
@@ -182,9 +182,6 @@ const pageSwitchingAnimationOptions: Record<string, OptionItem> = PageSwitchingA
 const copyIcon = markRaw(DocumentCopy);
 const resetIcon = markRaw(RefreshLeft);
 
-// AI 系统级开关
-const aiSystemEnabled = appConfig.aiEnabled;
-
 // 加载状态
 const copyLoading = ref(false);
 const resetLoading = ref(false);

src/settings.ts

@@ -18,7 +18,6 @@ export const appConfig = {
 
   // 功能开关
   tenantEnabled: env.VITE_APP_TENANT_ENABLED === "true",
-  aiEnabled: env.VITE_ENABLE_AI_ASSISTANT === "true",
 } as const;
 
 // ============================================

src/store/modules/settings.ts

@@ -2,7 +2,7 @@ import { SidebarColor, ThemeMode } from "@/enums";
 import type { LayoutMode } from "@/enums";
 import { applyTheme, generateThemeColors, toggleDarkMode, toggleSidebarColor } from "@/utils/theme";
 import { STORAGE_KEYS } from "@/constants";
-import { appConfig, defaults } from "@/settings";
+import { defaults } from "@/settings";
 
 export const useSettingsStore = defineStore("setting", () => {
   // 界面显示
@@ -30,9 +30,9 @@ export const useSettingsStore = defineStore("setting", () => {
   const grayMode = useStorage(STORAGE_KEYS.GRAY_MODE, false);
   const colorWeak = useStorage(STORAGE_KEYS.COLOR_WEAK, false);
 
-  // AI 助手：系统级 && 用户级
-  const userEnableAi = useStorage(STORAGE_KEYS.ENABLE_AI_ASSISTANT, false);
-  const enableAiAssistant = computed(() => appConfig.aiEnabled && userEnableAi.value);
+  // AI 助手：用户级开关（默认开启）
+  const userEnableAi = useStorage(STORAGE_KEYS.ENABLE_AI_ASSISTANT, true);
+  const enableAiAssistant = computed(() => userEnableAi.value);
 
   // 主题变化监听
   watch(