i18n: complete internationalization for provider and usage query panels

- Add 45+ new translation keys for usage query and usage script features
- Fix duplicate provider object in translation files that caused missing translations
- Remove all hardcoded Chinese text and defaultValue fallbacks from components
- Add proper translations for:
  * Usage footer (query status, plan usage display)
  * Usage script modal (script editor, validation, test controls)
  * Provider forms (basic fields, endpoints, model selectors)
  * Provider dialogs (add/edit hints and titles)

Modified 16 files:
- 2 translation files (zh.json, en.json)
- 14 component files (removed defaultValue, added t() calls)

All UI text now properly supports Chinese/English switching.

src/components/providers/forms/CommonConfigEditor.tsx

@@ -51,7 +51,7 @@ export function CommonConfigEditor({
       <div className="space-y-2">
         <div className="flex items-center justify-between">
           <Label htmlFor="settingsConfig">
-            {t("provider.configJson", { defaultValue: "配置 JSON" })}
+            {t("provider.configJson")}
           </Label>
           <div className="flex items-center gap-2">
             <label className="inline-flex items-center gap-2 text-sm text-muted-foreground cursor-pointer">