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/Frontend/src/hooks/use-license.ts

@@ -0,0 +1,24 @@
+import { useQuery } from "@tanstack/react-query";
+import { apiRequest } from "@/lib/queryClient";
+
+interface LicenseStatus {
+  activated: boolean;
+  expired: boolean;
+  expiry: string | null;
+  daysLeft: number | null;
+}
+
+export function useLicense() {
+  const { data, isLoading } = useQuery<LicenseStatus>({
+    queryKey: ["/api/license/status"],
+    queryFn: async () => {
+      const res = await apiRequest("GET", "/api/license/status");
+      return res.json();
+    },
+    staleTime: 1000 * 60 * 5, // cache for 5 minutes
+  });
+
+  const isLicensed = !isLoading && !!data?.activated && !data?.expired;
+
+  return { isLicensed, isLoading, licenseData: data };
+}