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/schemas/results/CloudFolderUpsertResult.schema.js

@@ -40,9 +40,11 @@ exports.CloudFolderUpsertResultSchema = z.object({
     userId: z.number().int(),
     name: z.string(),
     parentId: z.number().int().optional(),
+    patientId: z.number().int().optional(),
     parent: z.unknown().optional(),
     children: z.array(z.unknown()),
     user: z.unknown(),
+    patient: z.unknown().optional(),
     files: z.array(z.unknown()),
     createdAt: z.date(),
     updatedAt: z.date()