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>

apps/SeleniumService/agent.py

@@ -315,7 +315,15 @@ async def start_workflow(request: Request):
 
             if result.get("status") != "success":
                 return {"status": "error", "message": result.get("message")}
-            
+
+            # Convert pdf_path to pdf_url so the frontend can fetch it
+            if result.get("pdf_path"):
+                filename = os.path.basename(result["pdf_path"])
+                port = os.getenv("PORT", "5002")
+                url_host = os.getenv("HOST", "localhost")
+                result["pdf_url"] = f"http://{url_host}:{port}/downloads/{filename}"
+                print(f"DEBUG: Generated pdf_url = {result['pdf_url']}")
+
             return result
         except Exception as e:
             return {"status": "error", "message": str(e)}