fix: extract appointmentDate for multi_claim/batch_claim/preauth intents

The classifier prompt only told the AI that appointmentDate applies to
schedule_appointment/claim_only/check_and_claim, so a trailing date like
"all on 6/23/26" was dropped for multi-patient claims even though the
workflow already reads c.appointmentDate for those intents and silently
defaulted to today.

Also add Prisma config/seed scripts and shopping-vendor types/schema updates.

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

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

@@ -102,8 +102,12 @@ Intents:
                           e.g. "claim #13 crown for flor and claim d5212 for bian"
                           e.g. "claim perio exam for Maria and claim adult prophy for John"
                           e.g. "claim D0120 for Jane and D1110 for Bob"
+                          e.g. "claim post #6 for A and comp #10 DL for B, all on 6/23/26"
+                            → claimGroups: [{patientName:"A", procedureNames:["post #6"]}, {patientName:"B", procedureNames:["comp #10 DL"]}], appointmentDate: "2026-06-23"
                           Use this when each patient has their OWN distinct set of procedures.
                           Put each patient+procedures group into the "claimGroups" array.
+                          A trailing date phrase like "all on <date>" or "on <date>" at the end of the message sets
+                          appointmentDate for EVERY group — do not skip it just because it comes after multiple patients.
                           Do NOT use batch_claim for this — batch_claim is ONLY for the SAME procedures applied to ALL patients.
 - batch_check_and_claim : user provides MULTIPLE member IDs with DOBs AND wants to claim PROCEDURES for all of them
                           e.g. "check mh for 100xxxx 10/10/1988 and 200xxxx 5/5/2000, and claim perio exam and adult prophy"
@@ -192,9 +196,13 @@ Rules:
   Extract just the name (without "Dr." prefix unless it's part of the name), omit if not mentioned
 - Keep fallbackReply to 1-2 sentences
 - For navigate intents, fallbackReply = "Opening the [page] page..." (e.g. "Opening the eligibility page...")
-- appointmentDate applies to BOTH schedule_appointment AND claim_only/check_and_claim:
+- appointmentDate applies to ALL claim/scheduling intents — schedule_appointment, claim_only,
+  check_and_claim, batch_claim, multi_claim, batch_check_and_claim, and preauth:
   always set it to today's date (${today}) when the user says "today", "this visit", or similar
   set it to the specified date when the user mentions a date (e.g. "05/15/2026")
+  This applies even when the date is mentioned once at the END of the message and covers
+  multiple patients/groups (e.g. "...claim X for A and Y for B, all on 6/23/26" → appointmentDate
+  applies to every group, not just the last one mentioned)
   omit it only when no date is mentioned at all (the backend will find the last appointment)
 - IMPORTANT: Users type dates in American M/D/YYYY format (month first, then day).
   e.g. "6/12/2026" means June 12 2026 (NOT December 6). "1/5/2026" means January 5 2026.