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/ClaimCreateManyAppointmentInput.schema.js

@@ -56,6 +56,7 @@ const makeSchema = () => z.object({
     updatedAt: z.coerce.date().optional(),
     status: ClaimStatus_schema_1.ClaimStatusSchema.optional(),
     claimNumber: z.string().optional().nullable(),
+    preAuthNumber: z.string().optional().nullable(),
     npiProviderId: z.number().int().optional().nullable()
 }).strict();
 exports.ClaimCreateManyAppointmentInputObjectSchema = makeSchema();