feat: payment PDF extraction, import, and remittance tracking

- Add Upload Payment Documents section with Extract & Download (Excel)
  and Extract & Import (database) buttons
- PDF extractor (pdfplumber) parses MassHealth RA PDFs: two-pass
  strategy joins summary-page ICN/patient map with detail-page
  procedure data (CDT code, paid code, tooth, date, allowed amount)
- RA cover-page summary (Payee ID, RA #, Payment Amount, etc.)
  included as separate Excel sheet; numeric values written as numbers
- Backend PDF import route groups rows by Member #, finds/creates
  patient, creates Payment + ServiceLines with ICN per procedure
- Add icn, paidCode, allowedAmount fields to ServiceLine schema
- Payments table: status simplified to Paid in Full / Balance;
  adjustment auto-computed on mhPaidAmount/copayment change;
  Paid in Full and Revert buttons with confirmation dialogs
- Edit Payment modal: shows ICN, Paid Code, Allowed Amount per line
- PDF Import badge distinguishes from OCR imports in payments table

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

apps/Backend/src/routes/index.ts

@@ -20,6 +20,7 @@ import paymentsRoutes from "./payments";
 import databaseManagementRoutes from "./database-management";
 import notificationsRoutes from "./notifications";
 import paymentOcrRoutes from "./paymentOcrExtraction";
+import paymentPdfRoutes from "./paymentPdfExtraction";
 import cloudStorageRoutes from "./cloud-storage";
 import paymentsReportsRoutes from "./payments-reports";
 import exportPaymentsReportsRoutes from "./export-payments-reports";
@@ -53,6 +54,7 @@ router.use("/payments", paymentsRoutes);
 router.use("/database-management", databaseManagementRoutes);
 router.use("/notifications", notificationsRoutes);
 router.use("/payment-ocr", paymentOcrRoutes);
+router.use("/payment-pdf", paymentPdfRoutes);
 router.use("/cloud-storage", cloudStorageRoutes);
 router.use("/payments-reports", paymentsReportsRoutes);
 router.use("/export-payments-reports", exportPaymentsReportsRoutes);