fix: surface backend error details in proxy toast messages

The takeover.failed i18n template lacked the {{detail}} placeholder
and three useProxyStatus onError callbacks omitted the detail variable,
so proxy start/stop/takeover failures all displayed a generic message
regardless of the underlying cause.

src/components/SubscriptionQuotaFooter.tsx

@@ -205,7 +205,9 @@ export const SubscriptionQuotaView: React.FC<SubscriptionQuotaViewProps> = ({
   }
 
   // 成功获取数据
-  const tiers = (quota.tiers || []).filter((tier) => tier.name in TIER_I18N_KEYS);
+  const tiers = (quota.tiers || []).filter(
+    (tier) => tier.name in TIER_I18N_KEYS,
+  );
   if (tiers.length === 0) return null;
 
   // ── inline 模式：紧凑两行显示 ──

src/hooks/useProxyStatus.ts

@@ -57,6 +57,7 @@ export function useProxyStatus() {
         t("common.unknown", { defaultValue: "未知错误" });
       toast.error(
         t("proxy.server.startFailed", {
+          detail,
           defaultValue: `启动代理服务失败: ${detail}`,
         }),
       );
@@ -87,6 +88,7 @@ export function useProxyStatus() {
         t("common.unknown", { defaultValue: "未知错误" });
       toast.error(
         t("proxy.stopWithRestoreFailed", {
+          detail,
           defaultValue: `停止失败: ${detail}`,
         }),
       );
@@ -129,6 +131,7 @@ export function useProxyStatus() {
         t("common.unknown", { defaultValue: "未知错误" });
       toast.error(
         t("proxy.takeover.failed", {
+          detail,
           defaultValue: `操作失败: ${detail}`,
         }),
       );

src/i18n/locales/en.json

@@ -2056,7 +2056,7 @@
       "hint": "Select apps to route — once enabled, requests from that app will go through local routing",
       "enabled": "{{app}} routing enabled",
       "disabled": "{{app}} routing disabled",
-      "failed": "Failed to toggle routing",
+      "failed": "Failed to toggle routing: {{detail}}",
       "tooltip": {
         "active": "{{appLabel}} is routing - {{address}}:{{port}}\nSwitch provider for hot switching",
         "broken": "{{appLabel}} is routing, but routing service is not running",

src/i18n/locales/ja.json

@@ -2056,7 +2056,7 @@
       "hint": "ルーティングするアプリを選択します。有効にすると、そのアプリのリクエストはローカルルーティング経由で転送されます",
       "enabled": "{{app}} ルーティング有効",
       "disabled": "{{app}} ルーティング無効",
-      "failed": "ルーティングの切り替えに失敗しました",
+      "failed": "ルーティングの切り替えに失敗しました: {{detail}}",
       "tooltip": {
         "active": "{{appLabel}} がルーティング中 - {{address}}:{{port}}\nホットスイッチングのためプロバイダを切り替え",
         "broken": "{{appLabel}} がルーティング中ですが、ルーティングサービスが実行されていません",

src/i18n/locales/zh.json

@@ -2057,7 +2057,7 @@
       "hint": "选择要路由的应用，启用后该应用的请求将通过本地路由转发",
       "enabled": "{{app}} 路由已启用",
       "disabled": "{{app}} 路由已关闭",
-      "failed": "切换路由状态失败",
+      "failed": "切换路由状态失败: {{detail}}",
       "tooltip": {
         "active": "{{appLabel}} 路由中 - {{address}}:{{port}}\n切换该应用供应商为热切换",
         "broken": "{{appLabel}} 路由中，但路由服务未运行",