long-agent c2096ff008 fix: wrap AssignRoles in transaction and eliminate N+1 queries ...

- AssignRoles: wrap DeleteByUserID + BatchCreate in DB transaction (P1)
- GetUserRoles: use GetByIDs batch query instead of per-role GetByID loop (N+1 fix)
- ListAdmins: use GetByIDs batch query instead of per-user GetByID loop (N+1 fix)
- Add WithTx/DB methods to UserRoleRepository for transaction support
- Add GetByIDs to UserRepository (batch user lookup)
- Add .gitattributes to normalize line endings to LF (P2)

2026-04-11 10:32:33 +08:00

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