fix(data-transfer): handle missing owner role policy and align web sync behavior

* Feat: Add PostgreSQL transfer ownership preview and resolution

- Add ownership policy support for data transfers: preserve, skip, and reassign missing owners
- Preview missing PostgreSQL roles before creating target schema objects
- Show ownership confirmation dialog when target roles are missing
- Allow users to skip ownership changes or reassign missing owners to the target connection user
- Add Tauri and HTTP API support for ownership preview
- Apply ownership statements according to selected policy during PostgreSQL transfers
- Add Chinese localization for ownership confirmation UI

* Feat: Add ownership confirmation localization

- Add ownership confirmation messages for supported desktop locales
- Include skip and confirm labels for ownership handling
- Update transfer test requests to use Preserve ownership policy

apps/desktop/src/lib/backend/api.ts

@@ -278,6 +278,7 @@ export const nacosRawRequest = forward("nacosRawRequest");
 // Data Transfer
 export const startTransfer = forward("startTransfer");
 export const cancelTransfer = forward("cancelTransfer");
+export const previewTransferOwnership = forward("previewTransferOwnership");
 export const sortTablesByFkDependency = forward("sortTablesByFkDependency");
 
 // Table File Import
@@ -511,6 +512,8 @@ export type {
   TransferProgress,
   TransferMode,
   TransferTableNameCase,
+  TransferOwnershipPolicy,
+  TransferOwnershipPreview,
   TableImportMode,
   TableImportStatus,
   TableImportSourceFormat,

apps/desktop/src/lib/backend/http.ts

@@ -75,6 +75,7 @@ import type {
   SqlFileProgress,
   TransferRequest,
   TransferProgress,
+  TransferOwnershipPreview,
   TableImportPreviewRequest,
   TableImportPreview,
   TableImportRequest,
@@ -1319,6 +1320,10 @@ export async function cancelTransfer(transferId: string): Promise<void> {
   return post("/api/transfer/cancel", { transferId });
 }
 
+export async function previewTransferOwnership(request: TransferRequest): Promise<TransferOwnershipPreview> {
+  return post("/api/transfer/ownership-preview", { request });
+}
+
 export interface SortTablesByFkOptions {
   connectionId: string;
   database: string;

apps/desktop/src/lib/backend/tauri.ts

@@ -1889,6 +1889,7 @@ export async function listenSqlFileProgress(handler: (progress: SqlFileProgress)
 // --- Data Transfer ---
 export type TransferMode = "append" | "overwrite" | "upsert";
 export type TransferTableNameCase = "preserve" | "lower" | "upper";
+export type TransferOwnershipPolicy = "preserve" | "skip" | "reassignMissing";
 
 export interface TransferRequest {
   transferId: string;
@@ -1902,9 +1903,15 @@ export interface TransferRequest {
   createTable: boolean;
   mode: TransferMode;
   targetTableNameCase: TransferTableNameCase;
+  ownershipPolicy?: TransferOwnershipPolicy;
   batchSize: number;
 }
 
+export interface TransferOwnershipPreview {
+  missingOwners: string[];
+  targetOwner: string;
+}
+
 export interface TransferProgress {
   transferId: string;
   table: string;
@@ -1943,6 +1950,10 @@ export async function cancelTransfer(transferId: string): Promise<void> {
   return invoke("cancel_transfer", { transferId });
 }
 
+export async function previewTransferOwnership(request: TransferRequest): Promise<TransferOwnershipPreview> {
+  return invoke("preview_transfer_ownership", { request });
+}
+
 export interface SortTablesByFkOptions {
   connectionId: string;
   database: string;