feat(fusion_portal): assessment-visit redesign - live on westin 19.0.2.9.0

Bundles multiple assessments per home visit; on completion groups them by
funding workflow (x_fc_sale_type) into one draft sale order per workflow
(March of Dimes / ADP / ODSP / WSIB / private / hardship / insurance).
Adds the mobility scooter ADP device type, the power-mobility home-access
rule, ADP multi-device combination guard, and the portal visit workspace.

Verified on a westin-v19 clone (clean registry load + funding-grouping
smoke test) then deployed to westin prod (fusion_portal 19.0.2.9.0).
Prod's pre-existing orphaned tax links were preserved (Odoo skips existing
FKs), pending a later audit.

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

fusion_portal/models/accessibility_assessment.py

@@ -157,7 +157,14 @@ class FusionAccessibilityAssessment(models.Model):
         readonly=True,
         copy=False,
     )
-    
+    visit_id = fields.Many2one(
+        'fusion.assessment.visit',
+        string='Assessment Visit',
+        ondelete='set null',
+        index=True,
+        help='The home visit this accessibility assessment belongs to.',
+    )
+
     # Dates
     assessment_date = fields.Date(
         string='Assessment Date',