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

crates/dbx-core/tests/live_sqlserver_completion.rs

@@ -401,6 +401,7 @@ async fn live_sqlserver_transfer_table_skips_rowversion_insert_column() {
         create_table: true,
         mode: dbx_core::transfer::TransferMode::Append,
         target_table_name_case: dbx_core::transfer::TransferTableNameCase::Upper,
+        ownership_policy: dbx_core::transfer::TransferOwnershipPolicy::Preserve,
         batch_size: 100,
     };
     let result = dbx_core::transfer::transfer_table(