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/clock_role.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+#
+# Native shift role. Re-implements the small, useful subset of Odoo
+# Enterprise ``planning.role`` (name + colour) so Fusion Clock can colour and
+# label shifts on the portal without depending on the Enterprise Planning app.
+
+from random import randint
+
+from odoo import fields, models
+
+
+class FusionClockRole(models.Model):
+    _name = 'fusion.clock.role'
+    _description = 'Clock Shift Role'
+    _order = 'sequence, name'
+    _rec_name = 'name'
+
+    def _get_default_color(self):
+        return randint(1, 11)
+
+    name = fields.Char(required=True, translate=True)
+    color = fields.Integer(default=_get_default_color)
+    active = fields.Boolean(default=True)
+    sequence = fields.Integer(default=10)
+    company_id = fields.Many2one(
+        'res.company',
+        string='Company',
+        default=lambda self: self.env.company,
+    )
+
+    # Kanban colour code (1-11) -> hex, mirroring planning.role._get_color_from_code
+    # so the portal Schedule tab shows the same palette Planning used.
+    _COLOR_HEX = {
+        0: '#008784', 1: '#EE4B39', 2: '#F29648', 3: '#F4C609',
+        4: '#55B7EA', 5: '#71405B', 6: '#E86869', 7: '#008784',
+        8: '#267283', 9: '#BF1255', 10: '#2BAF73', 11: '#8754B0',
+    }
+
+    def _get_color_from_code(self, is_open_shift=False):
+        """Return a hex colour for this role. Open shifts get an '80' alpha
+        suffix (matching Planning's open-shift transparency convention)."""
+        self.ensure_one()
+        hex_value = self._COLOR_HEX.get(self.color, '#008784')
+        return hex_value + ('80' if is_open_shift else '')