### What problem does this PR solve?
```
admin> grant admin 'aaa@aaa1.com';
Fail to grant aaa@aaa1.com admin authorization, code: 404, message: User 'aaa@aaa1.com' not found
admin> grant admin 'aaa@aaa.com';
Grant successfully!
admin> revoke admin 'aaa1@aaa.com';
Fail to revoke aaa1@aaa.com admin authorization, code: 404, message: User 'aaa1@aaa.com' not found
admin> revoke admin 'aaa@aaa.com';
Revoke successfully!
admin> revoke admin 'aaa@aaa.com';
aaa@aaa.com isn't superuser, yet!
admin> grant admin 'aaa@aaa.com';
Grant successfully!
admin> grant admin 'aaa@aaa.com';
aaa@aaa.com is already superuser!
admin> revoke admin 'aaa@aaa.com';
Revoke successfully!
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
Manage message and use in agent.
Issue #4213
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
```
admin> show version;
show_version
+-----------------------+
| version |
+-----------------------+
| v0.21.0-241-gc6cf58d5 |
+-----------------------+
admin> \q
Goodbye!
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
Update version, and remove '_canvas' suffix in agent_category.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
- Add comprehensive RBAC support with role and permission management
- Implement CREATE/ALTER/DROP ROLE commands for role lifecycle
management
- Add GRANT/REVOKE commands for fine-grained permission control
- Support user role assignment via ALTER USER SET ROLE command
- Add SHOW ROLE and SHOW USER PERMISSION for permission inspection
- Implement corresponding RESTful API endpoints for role management
- Integrate role commands into existing command execution framework
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
