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/CodexFormFields.tsx

@@ -68,15 +68,11 @@ export function CodexFormFields({
       {shouldShowSpeedTest && (
         <EndpointField
           id="codexBaseUrl"
-          label={t("codexConfig.apiUrlLabel", { defaultValue: "API 端点" })}
+          label={t("codexConfig.apiUrlLabel")}
           value={codexBaseUrl}
           onChange={onBaseUrlChange}
-          placeholder={t("providerForm.codexApiEndpointPlaceholder", {
-            defaultValue: "https://api.example.com/v1",
-          })}
-          hint={t("providerForm.codexApiHint", {
-            defaultValue: "Codex API 端点地址",
-          })}
+          placeholder={t("providerForm.codexApiEndpointPlaceholder")}
+          hint={t("providerForm.codexApiHint")}
           onManageClick={() => onEndpointModalToggle(true)}
         />
       )}