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

src-tauri/src/lib.rs

@@ -1105,6 +1105,7 @@ pub fn run() {
             commands::update::get_system_proxy_url,
             commands::update::download_and_install_update,
             commands::transfer::start_transfer,
+            commands::transfer::preview_transfer_ownership,
             commands::transfer::cancel_transfer,
             commands::database_export::export_database_sql,
             commands::database_export::cancel_database_export,