feat: add Check MH Payment automation and MH Paid column

- Add selenium_MHPaymentCheckWorker.py: logs into MassHealth portal, navigates to Search Claims, enters claim number, extracts totalPaidAmount from results table
- Register /mh-payment-check endpoint in Selenium agent
- Add mhPaidAmount field to Payment model with migration
- Add PATCH /api/payments/:id/mh-payment-check backend route: fetches MH credentials, calls selenium, stores result
- Add Claim No. column (MassHealth claim number) as first data column in payments table
- Move Payment ID and Claim ID columns to end of table
- Add MH Paid column showing mhPaidAmount in green
- Wire Check MH Payment button to call API for each selected payment and refresh table

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

apps/Backend/src/routes/payments.ts

@@ -15,6 +15,7 @@ import {
 import { prisma } from "@repo/db/client";
 import { PaymentStatusSchema } from "@repo/db/types";
 import * as paymentService from "../services/paymentService";
+import { callPythonSync } from "../queue/processors/_shared";
 
 const paymentFilterSchema = z.object({
   from: z.string().datetime(),
@@ -426,6 +427,54 @@ router.patch(
   }
 );
 
+// PATCH /api/payments/:id/mh-payment-check
+router.patch(
+  "/:id/mh-payment-check",
+  async (req: Request, res: Response): Promise<any> => {
+    try {
+      const userId = req.user?.id;
+      if (!userId) return res.status(401).json({ message: "Unauthorized" });
+
+      const paymentId = parseIntOrError(req.params.id, "Payment ID");
+
+      const payment = await storage.getPaymentById(paymentId);
+      if (!payment) return res.status(404).json({ message: "Payment not found" });
+
+      const claimNumber = payment.claim?.claimNumber;
+      if (!claimNumber) {
+        return res.status(400).json({ message: "No claim number found for this payment" });
+      }
+
+      const credentials = await storage.getInsuranceCredentialByUserAndSiteKey(userId, "MH");
+      if (!credentials) {
+        return res.status(404).json({
+          message: "No MassHealth credentials found. Please add them in Settings.",
+        });
+      }
+
+      const seleniumResult = await callPythonSync("/mh-payment-check", {
+        data: {
+          massdhpUsername: credentials.username,
+          massdhpPassword: credentials.password,
+          claimNumber,
+        },
+      });
+
+      const mhPaidAmount = seleniumResult?.mhPaidAmount ?? 0;
+
+      const updated = await prisma.payment.update({
+        where: { id: paymentId },
+        data: { mhPaidAmount, updatedById: userId },
+      });
+
+      return res.json({ ...updated, mhPaidAmount: Number(updated.mhPaidAmount) });
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : "MH payment check failed";
+      return res.status(500).json({ message });
+    }
+  }
+);
+
 // DELETE /api/payments/:id
 router.delete("/:id", async (req: Request, res: Response): Promise<any> => {
   try {