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_postgres_transfer.rs

@@ -4,7 +4,7 @@ use dbx_core::models::connection::{ConnectionConfig, DatabaseType};
 use dbx_core::storage::Storage;
 use dbx_core::transfer::{
     get_db_type, transfer_postgres_schema_dependencies, transfer_postgres_schema_objects, transfer_table, TransferMode,
-    TransferRequest, TransferTableNameCase,
+    TransferOwnershipPolicy, TransferRequest, TransferTableNameCase,
 };
 use serde_json::json;
 
@@ -211,6 +211,7 @@ async fn live_postgres_transfer_preserves_data_and_schema_objects() {
         create_table: true,
         mode: TransferMode::Append,
         target_table_name_case: TransferTableNameCase::Preserve,
+        ownership_policy: TransferOwnershipPolicy::Preserve,
         batch_size: 100,
     };
 
@@ -491,6 +492,7 @@ async fn live_postgres_transfer_skips_create_ddl_for_existing_target_table() {
         create_table: true,
         mode: TransferMode::Append,
         target_table_name_case: TransferTableNameCase::Preserve,
+        ownership_policy: TransferOwnershipPolicy::Preserve,
         batch_size: 100,
     };