When a table has no PRIMARY KEY, use PostgreSQL's ctid (physical row ID)
to identify rows for UPDATE/DELETE operations instead of blocking edits.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add Rust backend: AppState with connection pool management,
TuskError handling, ConnectionConfig model, and all commands
for connections, schema browsing, query execution, data CRUD,
and CSV/JSON export via sqlx.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
