feat: chat window, preferred language, insurance contact, and AI call eligibility

- Schedule: right-click Chat option opens floating SMS chat window
- Chat window: SMS template selector with appointment date/time pre-filled
- Chat window: office name and phone pulled from Settings > Office Contact
- Chat window: Preferred Language selector (English, Spanish, Portuguese,
  Mandarin, Cantonese, Arabic, Haitian Creole) with fully translated templates
  and locale-aware date/time formatting
- Patient form: Preferred Language field (add/edit), default English
- Settings > Office Contact: added Dental Office Name field
- Settings > Advanced: Insurance Contact page (CRUD — company name + phone)
- Prisma schema: preferredLanguage on Patient, officeName on OfficeContact,
  new InsuranceContact model
- Patient management: Upload Patient Document moved below Patient Records
- Insurance Eligibility: AI Call Insurance collapsible section; insurance
  company and phone auto-populated from saved Insurance Contacts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Backend/src/routes/index.ts

@@ -30,6 +30,7 @@ import aiSettingsRoutes from "./ai-settings";
 import officeHoursRoutes from "./office-hours";
 import officeContactRoutes from "./office-contact";
 import procedureTimeslotRoutes from "./procedure-timeslot";
+import insuranceContactsRoutes from "./insurance-contacts";
 
 const router = Router();
 
@@ -64,5 +65,6 @@ router.use("/ai", aiSettingsRoutes);
 router.use("/office-hours", officeHoursRoutes);
 router.use("/office-contact", officeContactRoutes);
 router.use("/procedure-timeslot", procedureTimeslotRoutes);
+router.use("/insurance-contacts", insuranceContactsRoutes);
 
 export default router;