* 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
Previously the transfer dialog auto-detected schema (always picking "public"
or the first one), which prevented users from selecting tables in other
schemas. Now schema-aware databases show a schema dropdown for both source
and target.
Closes#485
lizzzzz777