fix: lock persona review and backup restore targets

[EterUltimate]

Summary

• lock persona/style review status updates by row id with optional group id guards
• fix style review approval passing group id as reviewer comment
• restore legacy/default persona backups into the current real AstrBot persona instead of the missing default placeholder
• add regression tests for single style approval targeting and default backup restore

Issue

Fixes #184

Validation

• python -m pytest tests\unit\test_persona_review_service.py tests\unit\test_persona_backup_service.py tests\unit\test_sqlalchemy_db_manager_contract.py -q
• python -m py_compile webui\services\persona_backup_service.py webui\services\persona_review_service.py services\database\facades\learning_facade.py services\database\sqlalchemy_database_manager.py
• python -m ruff check services\database\facades\learning_facade.py services\database\sqlalchemy_database_manager.py webui\services\persona_backup_service.py webui\services\persona_review_service.py tests\unit\test_persona_backup_service.py tests\unit\test_persona_review_service.py
• git diff --check

[sourcery-ai]

Sorry @EterUltimate, you have reached your weekly rate limit of 500000 diff characters.

Please try again later or upgrade to continue using Sourcery