feat: AI chat file uploads, RCT/PA tooth mapping, check+claim flow, service date column

- Chatbot: add paperclip button to attach X-ray/PDF files to claim submissions;
  files flow through chatbotFileStore into claim-form uploadedFiles for Selenium
- CDT lookup: auto-select D3310/D3320/D3330 by tooth number for RCT; strip #NN
  from procedure names before alias lookup so "1 pa, #3" → D0220 tooth 3;
  add "1 pa" alias for D0220; expand multi-PA notation via AI prompt rule
- AI classifier: add navigate_eligibility intent ("check mh" → /insurance-status);
  fix duplicate intent entry; add RCT and multi-PA prompt rules
- Check+claim flow: pass serviceDate through check_and_claim_ready actionData;
  tryClaimFromChatbot skips PDF preview and navigates straight to claims with
  memberId fallback lookup; wired into all provider onPdfReady callbacks
- Claims table: add Service Date column between Patient Name and Submission Date

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

apps/Backend/src/ai/internal-chat-workflow.ts

@@ -26,6 +26,8 @@ export interface CdtResult {
   code: string | null;
   description: string;
   input: string;
+  toothNumber?: string;
+  toothSurface?: string;
 }
 
 export interface ChatResponse {
@@ -181,6 +183,13 @@ export async function runInternalChatWorkflow(
       actionData: { url: "/appointments" },
     };
   }
+  if (intent === "navigate_eligibility") {
+    return {
+      reply: classification.fallbackReply ?? "Opening the eligibility page...",
+      action: "navigate",
+      actionData: { url: "/insurance-status" },
+    };
+  }
 
   // ── Find patient (record only, no eligibility) ──────────────────────────────
 
@@ -451,6 +460,7 @@ async function handleCheckAndClaim(
       autoCheck: siteKeyToAutoCheck(siteKey),
       cdtResults,
       matchedCodes: matched.map((r) => ({ code: r.code!, description: r.description, toothNumber: r.toothNumber, toothSurface: r.toothSurface })),
+      serviceDate: c.appointmentDate ?? null,
     },
   };
 }