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/tests/__init__.py

@@ -11,3 +11,10 @@ from . import test_settings
 from . import test_clock_kiosk
 from . import test_break_rules
 from . import test_pending_reason_exempt
+from . import test_role
+from . import test_recurrence
+from . import test_publish_range
+from . import test_open_shift
+from . import test_overnight
+from . import test_multishift_window
+from . import test_planning_migration