feat: add BCBS MA eligibility check with OTP flow

- New Selenium worker (fresh Chrome per run, no persistent session)
  login → OTP modal → eTools → ConnectCenter → Verification →
  New Eligibility Request → fill form (NPI, member ID, DOB) →
  Expand All → CDP PDF back to app
- Backend route fetches BCBS_MA credentials + provider NPI from settings
- Frontend OTP modal with 6-digit code entry
- BCBS MA added to insurance credentials dropdown in settings

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

apps/Frontend/src/components/settings/InsuranceCredForm.tsx

@@ -22,6 +22,7 @@ const SITE_KEY_OPTIONS = [
   { value: "TUFTS_SCO", label: "Tufts SCO (TUFTS_SCO)" },
   { value: "UNITED_SCO", label: "United SCO / DentalHub (UNITED_SCO)" },
   { value: "CCA", label: "CCA (CCA)" },
+  { value: "BCBS_MA", label: "BCBS MA (BCBS_MA)" },
 ];
 
 export function CredentialForm({ onClose, userId, defaultValues }: CredentialFormProps) {