feat: add Lab RX feature with template management and auto-seed defaults

- New lab_rx_template table with sortOrder and Prisma migrations
- Backend CRUD + reorder routes at /api/lab-rx/templates
- Auto-seeds 3 Highland Dental Studio defaults on first use per user
- LabRxModal: template picker, inline rename, up/down reorder, full
  template form with sections (Template Name / Lab Info / Case Details)
- RX popup: Tooth Number, Shade, Due Date, Doctor (from NPI providers),
  Instructions pre-filled with "Please make / Thank you!", print output
- lab-rx-templates.ts config file for future git-managed additions

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

apps/Backend/src/routes/index.ts

@@ -43,6 +43,7 @@ import shoppingVendorsRoutes from "./shopping-vendors";
 import feeScheduleRoutes from "./feeSchedule";
 import licenseRoutes from "./license";
 import insuranceStatusBcbsMaRoutes from "./insuranceStatusBcbsMa";
+import labRxRoutes from "./lab-rx";
 
 const router = Router();
 
@@ -90,5 +91,6 @@ router.use("/commissions", commissionsRoutes);
 router.use("/shopping-vendors", shoppingVendorsRoutes);
 router.use("/fee-schedule", feeScheduleRoutes);
 router.use("/license", licenseRoutes);
+router.use("/lab-rx", labRxRoutes);
 
 export default router;