- i18n: complete remaining internationalization across the UI

- Locales: add and align keys (common.enterValidValue, apiKeyInput.*, jsonEditor.*, claudeConfig.*); fix zh common.unknown mapping
- ProviderForm: localize labels/placeholders/hints/errors; unify JSON/auth validation to providerForm.*; add wizard CTA for Codex custom with i18n; cancel uses common.cancel
- CodexConfigEditor: i18n for quick wizard, labels/placeholders/hints, common config modal (title/help/buttons)
- ClaudeConfigEditor: i18n for main label, common-config toggle/button, modal title/help, footer buttons
- EndpointSpeedTest: localize failed/noEndpoints/done and aria labels
- ApiKeyInput: i18n for placeholder and show/hide aria
- JsonEditor: i18n linter messages
- PresetSelector: remove hardcoded defaults, use i18n keys
- UpdateBadge: i18n close aria
- Build/typecheck: pass; scan shows no visible hardcoded Chinese strings outside locales

src/components/UpdateBadge.tsx

@@ -1,5 +1,6 @@
 import { X, Download } from "lucide-react";
 import { useUpdate } from "../contexts/UpdateContext";
+import { useTranslation } from "react-i18next";
 
 interface UpdateBadgeProps {
   className?: string;
@@ -8,6 +9,7 @@ interface UpdateBadgeProps {
 
 export function UpdateBadge({ className = "", onClick }: UpdateBadgeProps) {
   const { hasUpdate, updateInfo, isDismissed, dismissUpdate } = useUpdate();
+  const { t } = useTranslation();
 
   // 如果没有更新或已关闭，不显示
   if (!hasUpdate || isDismissed || !updateInfo) {
@@ -52,7 +54,7 @@ export function UpdateBadge({ className = "", onClick }: UpdateBadgeProps) {
           transition-colors
           focus:outline-none focus:ring-2 focus:ring-blue-500/20
         "
-        aria-label="关闭更新提醒"
+        aria-label={t("common.close")}
       >
         <X className="w-3 h-3 text-gray-400 dark:text-gray-500" />
       </button>