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/paymentPdfExtraction.ts

@@ -0,0 +1,78 @@
+import { Router, Request, Response } from "express";
+import multer from "multer";
+import axios from "axios";
+import FormData from "form-data";
+import { pdfImportService, PdfRow } from "../services/paymentService";
+
+const router = Router();
+const upload = multer({ storage: multer.memoryStorage() });
+
+const OCR_BASE_URL = process.env.OCR_SERVICE_BASE_URL || "http://localhost:5003";
+
+router.post(
+  "/extract",
+  upload.array("files"),
+  async (req: Request, res: Response): Promise<any> => {
+    const files = req.files as Express.Multer.File[] | undefined;
+
+    if (!files || files.length === 0) {
+      return res.status(400).json({ error: "No PDF files uploaded. Use field name 'files'." });
+    }
+
+    const bad = files.filter((f) => !f.originalname.toLowerCase().endsWith(".pdf"));
+    if (bad.length) {
+      return res.status(415).json({ error: `Only PDF files are allowed: ${bad.map((b) => b.originalname).join(", ")}` });
+    }
+
+    const form = new FormData();
+    for (const f of files) {
+      form.append("files", f.buffer, {
+        filename: f.originalname,
+        contentType: "application/pdf",
+        knownLength: f.size,
+      });
+    }
+
+    try {
+      const resp = await axios.post<{ rows: any[] }>(
+        `${OCR_BASE_URL}/extract/pdf/json`,
+        form,
+        {
+          headers: form.getHeaders(),
+          maxBodyLength: Infinity,
+          maxContentLength: Infinity,
+          timeout: 60_000,
+        }
+      );
+      return res.json({ rows: resp.data?.rows ?? [], headers: resp.data?.headers ?? [] });
+    } catch (err: any) {
+      const status  = err?.response?.status;
+      const detail  = err?.response?.data?.detail || err?.message || "Unknown error";
+      return res.status(500).json({ error: `PDF extraction failed${status ? ` (${status})` : ""}: ${detail}` });
+    }
+  }
+);
+
+// POST /api/payment-pdf/import
+// Accepts already-extracted rows and imports them into the database.
+router.post(
+  "/import",
+  async (req: Request, res: Response): Promise<any> => {
+    const userId = req.user?.id;
+    if (!userId) return res.status(401).json({ error: "Unauthorized" });
+
+    const { rows } = req.body as { rows: PdfRow[] };
+    if (!rows || !Array.isArray(rows) || rows.length === 0) {
+      return res.status(400).json({ error: "No rows provided." });
+    }
+
+    try {
+      const paymentIds = await pdfImportService.importRows(rows, userId);
+      return res.json({ message: "PDF rows imported successfully", paymentIds });
+    } catch (err: any) {
+      return res.status(500).json({ error: err?.message ?? "Import failed" });
+    }
+  }
+);
+
+export default router;