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/shared/schemas/variants/input/Claim.input.ts

@@ -5,7 +5,7 @@ import { ClaimStatusSchema } from '../../enums/ClaimStatus.schema';
 export const ClaimInputSchema = z.object({
     id: z.number().int(),
     patientId: z.number().int(),
-    appointmentId: z.number().int(),
+    appointmentId: z.number().int().optional().nullable(),
     userId: z.number().int(),
     staffId: z.number().int(),
     patientName: z.string(),
@@ -20,9 +20,10 @@ export const ClaimInputSchema = z.object({
     updatedAt: z.date(),
     status: ClaimStatusSchema,
     claimNumber: z.string().optional().nullable(),
+    preAuthNumber: z.string().optional().nullable(),
     npiProviderId: z.number().int().optional().nullable(),
     patient: z.unknown(),
-    appointment: z.unknown(),
+    appointment: z.unknown().optional().nullable(),
     user: z.unknown().optional().nullable(),
     staff: z.unknown().optional().nullable(),
     npiProvider: z.unknown().optional().nullable(),