feat: add license activation system with feature gates

- License key generator tool at ~/Desktop/LicenseGenerator
- Backend validator route (GET /api/license/status, POST /api/license/activate)
- Activation page in sidebar with status, key input, and free/premium feature list
- useLicense hook for frontend license state
- Feature gates: premium eligibility buttons (DDMA, DeltaIns, Tufts, United, CCA) disabled without license
- Feature gates: premium claim buttons (CCA, Delta MA, United, Tufts) and all PreAuth buttons disabled without license
- Free features always active: MassHealth eligibility/claim, Documents, Payments, Backups, Reports
- README: license key generator usage instructions

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

apps/Backend/src/routes/index.ts

@@ -39,6 +39,7 @@ import insuranceContactsRoutes from "./insurance-contacts";
 import commissionsRoutes from "./commissions";
 import shoppingVendorsRoutes from "./shopping-vendors";
 import feeScheduleRoutes from "./feeSchedule";
+import licenseRoutes from "./license";
 
 const router = Router();
 
@@ -82,5 +83,6 @@ router.use("/insurance-contacts", insuranceContactsRoutes);
 router.use("/commissions", commissionsRoutes);
 router.use("/shopping-vendors", shoppingVendorsRoutes);
 router.use("/fee-schedule", feeScheduleRoutes);
+router.use("/license", licenseRoutes);
 
 export default router;