fix(provider-form): prevent duplicate submissions on rapid button clicks (#1352)

Make ProviderForm.handleSubmit async and await onSubmit so react-hook-form's
isSubmitting state is tracked. Disable submit buttons in AddProviderDialog and
EditProviderDialog while submission is in flight via onSubmittingChange callback.

src/components/providers/EditProviderDialog.tsx

@@ -28,6 +28,7 @@ export function EditProviderDialog({
   isProxyTakeover = false,
 }: EditProviderDialogProps) {
   const { t } = useTranslation();
+  const [isFormSubmitting, setIsFormSubmitting] = useState(false);
 
   // 默认使用传入的 provider.settingsConfig，若当前编辑对象是"当前生效供应商"，则尝试读取实时配置替换初始值
   const [liveSettings, setLiveSettings] = useState<Record<
@@ -197,6 +198,7 @@ export function EditProviderDialog({
         <Button
           type="submit"
           form="provider-form"
+          disabled={isFormSubmitting}
           className="bg-primary text-primary-foreground hover:bg-primary/90"
         >
           <Save className="h-4 w-4 mr-2" />
@@ -210,6 +212,7 @@ export function EditProviderDialog({
         submitLabel={t("common.save")}
         onSubmit={handleSubmit}
         onCancel={() => onOpenChange(false)}
+        onSubmittingChange={setIsFormSubmitting}
         initialData={initialData}
         showButtons={false}
       />