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/SeleniumService/agent.py

@@ -8,6 +8,7 @@ from selenium_claimSubmitWorker import AutomationMassHealthClaimsLogin
 from selenium_eligibilityCheckWorker import AutomationMassHealthEligibilityCheck
 from selenium_claimStatusCheckWorker import AutomationMassHealthClaimStatusCheck
 from selenium_preAuthWorker import AutomationMassHealthPreAuth
+from selenium_MHPaymentCheckWorker import AutomationMassHealthPaymentCheck
 import os
 import time
 import helpers_ddma_eligibility as hddma
@@ -188,6 +189,34 @@ async def start_workflow(request: Request):
             async with lock:
                 active_jobs -= 1
 
+# Endpoint: 5 — Check MassHealth payment for a given claim number
+@app.post("/mh-payment-check")
+async def mh_payment_check(request: Request):
+    global active_jobs, waiting_jobs
+    data = await request.json()
+
+    async with lock:
+        waiting_jobs += 1
+
+    async with semaphore:
+        async with lock:
+            waiting_jobs -= 1
+            active_jobs += 1
+        try:
+            bot = AutomationMassHealthPaymentCheck(data)
+            result = bot.main_workflow("https://provider.masshealth-dental.org/mh_provider_login")
+
+            if result.get("status") != "success":
+                return {"status": "error", "message": result.get("message")}
+
+            return result
+        except Exception as e:
+            return {"status": "error", "message": str(e)}
+        finally:
+            async with lock:
+                active_jobs -= 1
+
+
 # Endpoint: 4 — Start the automation of cheking claim pre auth
 @app.post("/claim-pre-auth")
 async def start_workflow(request: Request):