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/findManyClaim.schema.js

@@ -60,6 +60,7 @@ exports.ClaimFindManySelectSchema = z.object({
     updatedAt: z.boolean().optional(),
     status: z.boolean().optional(),
     claimNumber: z.boolean().optional(),
+    preAuthNumber: z.boolean().optional(),
     npiProviderId: z.boolean().optional(),
     patient: z.boolean().optional(),
     appointment: z.boolean().optional(),
@@ -89,6 +90,7 @@ exports.ClaimFindManySelectZodSchema = z.object({
     updatedAt: z.boolean().optional(),
     status: z.boolean().optional(),
     claimNumber: z.boolean().optional(),
+    preAuthNumber: z.boolean().optional(),
     npiProviderId: z.boolean().optional(),
     patient: z.boolean().optional(),
     appointment: z.boolean().optional(),