fix: allow claims without appointment + support post/core multi-tooth input

- Make appointmentId nullable/optional in Prisma Zod schema via @zod rich
  comment so claims can be submitted without an existing appointment
- Convert undefined appointmentId to null in all claim form handlers and
  the backend claim creation endpoint
- Add AI classifier rule for expanding one procedure across multiple
  comma-separated tooth numbers (e.g. "post/core on #23, 24, 25, 26")
- Add "post/core" (slash) alias to CDT lookup maps

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

packages/db/generated/prisma/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-210cfd1f3d7388620d3c172d9abdf5f3d200db6f7d9237d98c6c0804e5262885",
+  "name": "prisma-client-d351a8e2afa5a626b25c24fc325b9f8c2c9b0ee5bb0f800b83ea538e43d12368",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "default.js",