feat: persist AI conversation state in DB and fix LangGraph flow bugs

- Replace in-memory Maps in aiHandoffStore with DB-backed async functions
  using new patient_conversation table (stage + aiHandoff per patient)
- Add afterHoursEnabled to ai_settings table (persists across restarts)
- Fix runtime crash in reschedule-graph: mon/tue/wed variables were out
  of scope in the next-week fallback branch (ReferenceError)
- Wire rescheduleGreeting and generalFallback chat templates through to
  LangGraph nodes so user-configured messages take effect
- Add otherNode to reminder-graph to handle unclassified patient replies
  (e.g. "I want another appointment") and route to booking flow
- Fetch chatTemplates once per webhook request instead of per stage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/shared/schemas/objects/PatientUncheckedUpdateWithoutProceduresInput.schema.ts

@@ -12,7 +12,8 @@ import { ClaimUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as ClaimU
 import { PdfGroupUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as PdfGroupUncheckedUpdateManyWithoutPatientNestedInputObjectSchema } from './PdfGroupUncheckedUpdateManyWithoutPatientNestedInput.schema';
 import { PaymentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as PaymentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema } from './PaymentUncheckedUpdateManyWithoutPatientNestedInput.schema';
 import { CommunicationUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as CommunicationUncheckedUpdateManyWithoutPatientNestedInputObjectSchema } from './CommunicationUncheckedUpdateManyWithoutPatientNestedInput.schema';
-import { PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema } from './PatientDocumentUncheckedUpdateManyWithoutPatientNestedInput.schema'
+import { PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema as PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema } from './PatientDocumentUncheckedUpdateManyWithoutPatientNestedInput.schema';
+import { PatientConversationUncheckedUpdateOneWithoutPatientNestedInputObjectSchema as PatientConversationUncheckedUpdateOneWithoutPatientNestedInputObjectSchema } from './PatientConversationUncheckedUpdateOneWithoutPatientNestedInput.schema'
 
 const makeSchema = () => z.object({
   id: z.union([z.number().int(), z.lazy(() => IntFieldUpdateOperationsInputObjectSchema)]).optional(),
@@ -41,7 +42,8 @@ const makeSchema = () => z.object({
   groups: z.lazy(() => PdfGroupUncheckedUpdateManyWithoutPatientNestedInputObjectSchema).optional(),
   payment: z.lazy(() => PaymentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema).optional(),
   communications: z.lazy(() => CommunicationUncheckedUpdateManyWithoutPatientNestedInputObjectSchema).optional(),
-  documents: z.lazy(() => PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema).optional()
+  documents: z.lazy(() => PatientDocumentUncheckedUpdateManyWithoutPatientNestedInputObjectSchema).optional(),
+  conversation: z.lazy(() => PatientConversationUncheckedUpdateOneWithoutPatientNestedInputObjectSchema).optional()
 }).strict();
 export const PatientUncheckedUpdateWithoutProceduresInputObjectSchema: z.ZodType<Prisma.PatientUncheckedUpdateWithoutProceduresInput> = makeSchema() as unknown as z.ZodType<Prisma.PatientUncheckedUpdateWithoutProceduresInput>;
 export const PatientUncheckedUpdateWithoutProceduresInputObjectZodSchema = makeSchema();