feat(claude): show proxy hint when switching to OpenAI Chat format provider

Display an info toast when switching to a provider that uses OpenAI Chat
format (apiFormat === "openai_chat"), reminding users to enable the proxy
service. Move toast logic from mutation to useProviderActions for better
control over notification content based on provider properties.

src/hooks/useProviderActions.ts

@@ -84,11 +84,43 @@ export function useProviderActions(activeApp: AppId) {
       try {
         await switchProviderMutation.mutateAsync(provider.id);
         await syncClaudePlugin(provider);
+
+        // 根据供应商类型显示不同的成功提示
+        if (
+          activeApp === "claude" &&
+          provider.category !== "official" &&
+          provider.meta?.apiFormat === "openai_chat"
+        ) {
+          // OpenAI Chat 格式供应商：显示代理提示
+          toast.info(
+            t("notifications.openAIChatFormatHint", {
+              defaultValue:
+                "此供应商使用 OpenAI Chat 格式，需要开启代理服务才能正常使用",
+            }),
+            {
+              duration: 5000,
+              closeButton: true,
+            },
+          );
+        } else {
+          // 普通供应商：显示切换成功
+          // OpenCode: show "added to config" message instead of "switched"
+          const messageKey =
+            activeApp === "opencode"
+              ? "notifications.addToConfigSuccess"
+              : "notifications.switchSuccess";
+          const defaultMessage =
+            activeApp === "opencode" ? "已添加到配置" : "切换成功！";
+
+          toast.success(t(messageKey, { defaultValue: defaultMessage }), {
+            closeButton: true,
+          });
+        }
       } catch {
-        // 错误提示由 mutation 与同步函数处理
+        // 错误提示由 mutation 处理
       }
     },
-    [switchProviderMutation, syncClaudePlugin],
+    [switchProviderMutation, syncClaudePlugin, activeApp, t],
   );
 
   // 删除供应商

src/i18n/locales/en.json

@@ -155,7 +155,8 @@
     "deleteSuccess": "Provider deleted",
     "deleteFailed": "Failed to delete provider: {{error}}",
     "settingsSaved": "Settings saved",
-    "settingsSaveFailed": "Failed to save settings: {{error}}"
+    "settingsSaveFailed": "Failed to save settings: {{error}}",
+    "openAIChatFormatHint": "This provider uses OpenAI Chat format and requires the proxy service to be enabled"
   },
   "confirm": {
     "deleteProvider": "Delete Provider",

src/i18n/locales/ja.json

@@ -155,7 +155,8 @@
     "deleteSuccess": "プロバイダーを削除しました",
     "deleteFailed": "プロバイダーの削除に失敗しました: {{error}}",
     "settingsSaved": "設定を保存しました",
-    "settingsSaveFailed": "設定の保存に失敗しました: {{error}}"
+    "settingsSaveFailed": "設定の保存に失敗しました: {{error}}",
+    "openAIChatFormatHint": "このプロバイダーは OpenAI Chat フォーマットを使用しており、プロキシサービスの有効化が必要です"
   },
   "confirm": {
     "deleteProvider": "プロバイダーを削除",

src/i18n/locales/zh.json

@@ -155,7 +155,8 @@
     "deleteSuccess": "供应商已删除",
     "deleteFailed": "删除供应商失败：{{error}}",
     "settingsSaved": "设置已保存",
-    "settingsSaveFailed": "保存设置失败：{{error}}"
+    "settingsSaveFailed": "保存设置失败：{{error}}",
+    "openAIChatFormatHint": "此供应商使用 OpenAI Chat 格式，需要开启代理服务才能正常使用"
   },
   "confirm": {
     "deleteProvider": "删除供应商",

src/lib/query/mutations.ts

@@ -171,17 +171,8 @@ export const useSwitchProviderMutation = (appId: AppId) => {
         );
       }
 
-      // OpenCode: show "added to config" message instead of "switched"
-      const messageKey =
-        appId === "opencode"
-          ? "notifications.addToConfigSuccess"
-          : "notifications.switchSuccess";
-      const defaultMessage =
-        appId === "opencode" ? "已添加到配置" : "切换供应商成功";
-
-      toast.success(t(messageKey, { defaultValue: defaultMessage }), {
-        closeButton: true,
-      });
+      // Note: Success toast is handled by useProviderActions.switchProvider
+      // to allow customization based on provider properties (e.g., apiFormat)
     },
     onError: (error: Error) => {
       const detail = extractErrorMessage(error) || t("common.unknown");