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/shared/.prisma-zod-generator-manifest.json

@@ -1,7 +1,7 @@
 {
   "version": "1.0",
   "generatorVersion": "1.0.0",
-  "generatedAt": "2026-06-27T03:13:10.416Z",
+  "generatedAt": "2026-06-29T02:05:45.074Z",
   "outputPath": "/home/gg/Desktop/DentalManagementMH06/packages/db/shared",
   "files": [
     "schemas/enums/TransactionIsolationLevel.schema.ts",