feat: sync current providers to live files after config import

Core Improvements:
- Add sync_current_providers_live command to synchronize in-memory provider
  settings to corresponding live files (~/.claude/settings.json or ~/.codex/auth.json)
- Introduce partial-success state to distinguish between 'import succeeded
  but sync failed' scenario, providing clear user feedback
- Remove unused skip_live_backfill parameter from switch_provider command
- Separate responsibilities: backend handles import/backup, frontend handles
  sync/error presentation

Technical Details:
- Codex: sync auth.json + config.toml with MCP configuration
- Claude: sync settings.json
- Bidirectional sync: read back after write to update in-memory settings_config
- Full i18n support (English and Chinese)
- Graceful handling when no current provider is active

Affected Files:
- Backend: import_export.rs, commands.rs, lib.rs
- Frontend: useImportExport.ts, ImportExportSection.tsx, settings.ts
- i18n: en.json, zh.json

This ensures SSOT (Single Source of Truth) consistency between config.json
and live configuration files after import operations.

src/components/settings/ImportExportSection.tsx

@@ -167,6 +167,20 @@ function ImportStatusMessage({
     );
   }
 
+  if (status === "partial-success") {
+    return (
+      <div
+        className={`${baseClass} border-yellow-200 bg-yellow-100/70 text-yellow-700`}
+      >
+        <AlertCircle className="mt-0.5 h-4 w-4" />
+        <div className="space-y-1">
+          <p className="font-medium">{t("settings.importPartialSuccess")}</p>
+          <p>{t("settings.importPartialHint")}</p>
+        </div>
+      </div>
+    );
+  }
+
   const message = errorMessage || t("settings.importFailed");
 
   return (

src/hooks/useImportExport.ts

@@ -3,7 +3,12 @@ import { useTranslation } from "react-i18next";
 import { toast } from "sonner";
 import { settingsApi } from "@/lib/api";
 
-export type ImportStatus = "idle" | "importing" | "success" | "error";
+export type ImportStatus =
+  | "idle"
+  | "importing"
+  | "success"
+  | "partial-success"
+  | "error";
 
 export interface UseImportExportOptions {
   onImportSuccess?: () => void | Promise<void>;
@@ -86,8 +91,22 @@ export function useImportExport(
 
     try {
       const result = await settingsApi.importConfigFromFile(selectedFile);
-      if (result.success) {
-        setBackupId(result.backupId ?? null);
+      if (!result.success) {
+        setStatus("error");
+        const message =
+          result.message ||
+          t("settings.configCorrupted", {
+            defaultValue: "配置文件已损坏或格式不正确",
+          });
+        setErrorMessage(message);
+        toast.error(message);
+        return;
+      }
+
+      setBackupId(result.backupId ?? null);
+
+      try {
+        await settingsApi.syncCurrentProvidersLive();
         setStatus("success");
         toast.success(
           t("settings.importSuccess", {
@@ -98,15 +117,15 @@ export function useImportExport(
         successTimerRef.current = window.setTimeout(() => {
           void onImportSuccess?.();
         }, 1500);
-      } else {
-        setStatus("error");
-        const message =
-          result.message ||
-          t("settings.configCorrupted", {
-            defaultValue: "配置文件已损坏或格式不正确",
-          });
-        setErrorMessage(message);
-        toast.error(message);
+      } catch (error) {
+        console.error("[useImportExport] Failed to sync live config", error);
+        setStatus("partial-success");
+        toast.warning(
+          t("settings.importPartialSuccess", {
+            defaultValue:
+              "配置已导入，但同步到当前供应商失败。请手动重新选择一次供应商。",
+          }),
+        );
       }
     } catch (error) {
       console.error("[useImportExport] Failed to import config", error);

src/i18n/locales/en.json

@@ -123,6 +123,9 @@
     "importing": "Importing...",
     "importSuccess": "Import Successful!",
     "importFailed": "Import Failed",
+    "syncLiveFailed": "Imported, but failed to sync to the current provider. Please reselect the provider manually.",
+    "importPartialSuccess": "Config imported, but failed to sync to the current provider.",
+    "importPartialHint": "Please manually reselect the provider to refresh the live configuration.",
     "configExported": "Config exported to:",
     "exportFailed": "Export failed",
     "selectFileFailed": "Failed to select file",

src/i18n/locales/zh.json

@@ -123,6 +123,9 @@
     "importing": "导入中...",
     "importSuccess": "导入成功！",
     "importFailed": "导入失败",
+    "syncLiveFailed": "已导入，但同步到当前供应商失败，请手动重新选择一次供应商。",
+    "importPartialSuccess": "配置已导入，但同步到当前供应商失败。",
+    "importPartialHint": "请手动重新选择一次供应商以刷新对应配置。",
     "configExported": "配置已导出到：",
     "exportFailed": "导出失败",
     "selectFileFailed": "选择文件失败",

src/lib/api/settings.ts

@@ -97,6 +97,16 @@ export const settingsApi = {
     });
   },
 
+  async syncCurrentProvidersLive(): Promise<void> {
+    const result = (await invoke("sync_current_providers_live")) as {
+      success?: boolean;
+      message?: string;
+    };
+    if (!result?.success) {
+      throw new Error(result?.message || "Sync current providers failed");
+    }
+  },
+
   async openExternal(url: string): Promise<void> {
     try {
       const u = new URL(url);