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/BasicFormFields.tsx

@@ -25,14 +25,12 @@ export function BasicFormFields({ form }: BasicFormFieldsProps) {
         render={({ field }) => (
           <FormItem>
             <FormLabel>
-              {t("provider.name", { defaultValue: "供应商名称" })}
+              {t("provider.name")}
             </FormLabel>
             <FormControl>
               <Input
                 {...field}
-                placeholder={t("provider.namePlaceholder", {
-                  defaultValue: "例如：Claude 官方",
-                })}
+                placeholder={t("provider.namePlaceholder")}
               />
             </FormControl>
             <FormMessage />
@@ -46,7 +44,7 @@ export function BasicFormFields({ form }: BasicFormFieldsProps) {
         render={({ field }) => (
           <FormItem>
             <FormLabel>
-              {t("provider.websiteUrl", { defaultValue: "官网链接" })}
+              {t("provider.websiteUrl")}
             </FormLabel>
             <FormControl>
               <Input {...field} placeholder="https://" />

src/components/providers/forms/ClaudeFormFields.tsx

@@ -137,15 +137,11 @@ export function ClaudeFormFields({
       {shouldShowSpeedTest && (
         <EndpointField
           id="baseUrl"
-          label={t("providerForm.apiEndpoint", { defaultValue: "API 端点" })}
+          label={t("providerForm.apiEndpoint")}
           value={baseUrl}
           onChange={onBaseUrlChange}
-          placeholder={t("providerForm.apiEndpointPlaceholder", {
-            defaultValue: "https://api.example.com",
-          })}
-          hint={t("providerForm.apiHint", {
-            defaultValue: "API 端点地址用于连接服务器",
-          })}
+          placeholder={t("providerForm.apiEndpointPlaceholder")}
+          hint={t("providerForm.apiHint")}
           onManageClick={() => onEndpointModalToggle(true)}
         />
       )}

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)}
         />
       )}

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">

src/components/providers/forms/ProviderForm.tsx

@@ -554,7 +554,7 @@ export function ProviderForm({
         {showButtons && (
           <div className="flex justify-end gap-2">
             <Button variant="outline" type="button" onClick={onCancel}>
-              {t("common.cancel", { defaultValue: "取消" })}
+              {t("common.cancel")}
             </Button>
             <Button type="submit">{submitLabel}</Button>
           </div>

src/components/providers/forms/ProviderPresetSelector.tsx

@@ -28,7 +28,7 @@ export function ProviderPresetSelector({
   return (
     <div className="space-y-3">
       <FormLabel>
-        {t("providerPreset.label", { defaultValue: "预设供应商" })}
+        {t("providerPreset.label")}
       </FormLabel>
       <div className="flex flex-wrap gap-2">
         {/* 自定义按钮 */}
@@ -41,7 +41,7 @@ export function ProviderPresetSelector({
               : "bg-gray-100 dark:bg-gray-800 text-gray-500 dark:text-gray-400 hover:bg-gray-200 dark:hover:bg-gray-700"
           }`}
         >
-          {t("providerPreset.custom", { defaultValue: "自定义配置" })}
+          {t("providerPreset.custom")}
         </button>
 
         {/* 预设按钮 */}