feat(fusion_clock): native shift roles (fusion.clock.role) [A1-A3]

Replaces Odoo Planning's planning.role: name+colour model with the same
1-11 palette, employee default/allowed role fields, Employee Roles editor,
role_id on shift template + schedule with default resolution, ACLs, menus.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_clock/models/__init__.py

@@ -10,6 +10,7 @@ from . import clock_report
 from . import res_config_settings
 from . import clock_activity_log
 from . import clock_leave_request
+from . import clock_role
 from . import clock_shift
 from . import clock_schedule
 from . import clock_correction