feat: add PreAuth tab, preauth selenium flow, and PreAuth No column

- Insurance Forms modal: split into Insurance Claim / PreAuth tabs
- PreAuth tab: same patient info + service lines, no toggle/direct combos
- Excluded Recalls & New Patients, Composite Fillings (Front/Back), Pedo from PreAuth combos
- Extractions: replaced Simple/Surg/Baby Teeth EXT with Full Bony EXT (D7240)
- MH PreAuth button: rewritten selenium worker to use masshealth-dental.org,
  selects Dental Prior Authorization (2nd option), skips Date of Service field
- agent.py: convert pdf_path to pdf_url for /claim-pre-auth endpoint
- nginx + Express: raise body size limit to 50mb (fix 413 errors)
- DB schema: appointmentId optional on Claim, add preAuthNumber field, add PREAUTH status
- Backend: create PREAUTH claim record on preauth submit, save preAuthNumber on completion
- Claims table: add PreAuth No column (blue) next to Claim No

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

packages/db/generated/prisma/index-browser.js

@@ -231,6 +231,7 @@ exports.Prisma.ClaimScalarFieldEnum = {
   updatedAt: 'updatedAt',
   status: 'status',
   claimNumber: 'claimNumber',
+  preAuthNumber: 'preAuthNumber',
   npiProviderId: 'npiProviderId'
 };
 
@@ -540,7 +541,8 @@ exports.ClaimStatus = exports.$Enums.ClaimStatus = {
   APPROVED: 'APPROVED',
   CANCELLED: 'CANCELLED',
   REVIEW: 'REVIEW',
-  VOID: 'VOID'
+  VOID: 'VOID',
+  PREAUTH: 'PREAUTH'
 };
 
 exports.ServiceLineStatus = exports.$Enums.ServiceLineStatus = {