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/objects/ClaimMaxOrderByAggregateInput.schema.ts

@@ -5,7 +5,7 @@ import { SortOrderSchema } from '../enums/SortOrder.schema'
 const makeSchema = () => z.object({
   id: SortOrderSchema.optional(),
   patientId: SortOrderSchema.optional(),
-  appointmentId: SortOrderSchema.optional(),
+  appointmentId: z.number().int().int().optional(),
   userId: SortOrderSchema.optional(),
   staffId: SortOrderSchema.optional(),
   patientName: SortOrderSchema.optional(),