feat(fusion_claims): allow order-less tasks + service-repair SO flag

Relaxes _check_order_link to a no-op (service bookings auto-create their SO;
in-shop/walk-in tasks may have none) and adds x_fc_is_service_repair on
sale.order. The 'Service Repair' crm.tag from the plan is intentionally
omitted: fusion_claims does not depend on crm and sale.order has no tag_ids;
the boolean flag is the repair-SO identity.

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

fusion_claims/models/sale_order.py

@@ -338,6 +338,11 @@ class SaleOrder(models.Model):
         help='Type of sale for billing purposes. This field determines the workflow and billing rules.',
     )
     
+    x_fc_is_service_repair = fields.Boolean(
+        string='Service Repair', copy=False,
+        help='Auto-created from the technician service booking wizard.',
+    )
+
     x_fc_sale_type_locked = fields.Boolean(
         string='Sale Type Locked',
         compute='_compute_sale_type_locked',

fusion_claims/models/technician_task.py

@@ -9,7 +9,7 @@ features to the base fusion.technician.task model.
 """
 
 from odoo import models, fields, api, _
-from odoo.exceptions import UserError, ValidationError
+from odoo.exceptions import UserError
 from markupsafe import Markup
 import logging
 
@@ -104,15 +104,9 @@ class FusionTechnicianTaskClaims(models.Model):
 
     @api.constrains('sale_order_id', 'purchase_order_id')
     def _check_order_link(self):
-        for task in self:
-            if task.x_fc_sync_source:
-                continue
-            if task.task_type == 'ltc_visit':
-                continue
-            if not task.sale_order_id and not task.purchase_order_id:
-                raise ValidationError(_(
-                    "A task must be linked to either a Sale Order (Case) or a Purchase Order."
-                ))
+        # Relaxed 2026-06: service bookings auto-create their SO, and in-shop /
+        # walk-in tasks may legitimately have none. No order link is required anymore.
+        return
 
     # ------------------------------------------------------------------
     # HOOK OVERRIDES