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/PatientCreateWithoutConversationInput.schema.ts

@@ -0,0 +1,43 @@
+import * as z from 'zod';
+import type { Prisma } from '../../../generated/prisma';
+import { PatientStatusSchema } from '../enums/PatientStatus.schema';
+import { UserCreateNestedOneWithoutPatientsInputObjectSchema as UserCreateNestedOneWithoutPatientsInputObjectSchema } from './UserCreateNestedOneWithoutPatientsInput.schema';
+import { AppointmentCreateNestedManyWithoutPatientInputObjectSchema as AppointmentCreateNestedManyWithoutPatientInputObjectSchema } from './AppointmentCreateNestedManyWithoutPatientInput.schema';
+import { AppointmentProcedureCreateNestedManyWithoutPatientInputObjectSchema as AppointmentProcedureCreateNestedManyWithoutPatientInputObjectSchema } from './AppointmentProcedureCreateNestedManyWithoutPatientInput.schema';
+import { ClaimCreateNestedManyWithoutPatientInputObjectSchema as ClaimCreateNestedManyWithoutPatientInputObjectSchema } from './ClaimCreateNestedManyWithoutPatientInput.schema';
+import { PdfGroupCreateNestedManyWithoutPatientInputObjectSchema as PdfGroupCreateNestedManyWithoutPatientInputObjectSchema } from './PdfGroupCreateNestedManyWithoutPatientInput.schema';
+import { PaymentCreateNestedManyWithoutPatientInputObjectSchema as PaymentCreateNestedManyWithoutPatientInputObjectSchema } from './PaymentCreateNestedManyWithoutPatientInput.schema';
+import { CommunicationCreateNestedManyWithoutPatientInputObjectSchema as CommunicationCreateNestedManyWithoutPatientInputObjectSchema } from './CommunicationCreateNestedManyWithoutPatientInput.schema';
+import { PatientDocumentCreateNestedManyWithoutPatientInputObjectSchema as PatientDocumentCreateNestedManyWithoutPatientInputObjectSchema } from './PatientDocumentCreateNestedManyWithoutPatientInput.schema'
+
+const makeSchema = () => z.object({
+  firstName: z.string(),
+  lastName: z.string(),
+  dateOfBirth: z.coerce.date().optional().nullable(),
+  gender: z.string(),
+  phone: z.string(),
+  email: z.string().optional().nullable(),
+  address: z.string().optional().nullable(),
+  city: z.string().optional().nullable(),
+  zipCode: z.string().optional().nullable(),
+  insuranceProvider: z.string().optional().nullable(),
+  insuranceId: z.string().optional().nullable(),
+  groupNumber: z.string().optional().nullable(),
+  policyHolder: z.string().optional().nullable(),
+  allergies: z.string().optional().nullable(),
+  medicalConditions: z.string().optional().nullable(),
+  preferredLanguage: z.string().optional().nullable(),
+  status: PatientStatusSchema.optional(),
+  createdAt: z.coerce.date().optional(),
+  updatedAt: z.coerce.date().optional(),
+  user: z.lazy(() => UserCreateNestedOneWithoutPatientsInputObjectSchema),
+  appointments: z.lazy(() => AppointmentCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  procedures: z.lazy(() => AppointmentProcedureCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  claims: z.lazy(() => ClaimCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  groups: z.lazy(() => PdfGroupCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  payment: z.lazy(() => PaymentCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  communications: z.lazy(() => CommunicationCreateNestedManyWithoutPatientInputObjectSchema).optional(),
+  documents: z.lazy(() => PatientDocumentCreateNestedManyWithoutPatientInputObjectSchema).optional()
+}).strict();
+export const PatientCreateWithoutConversationInputObjectSchema: z.ZodType<Prisma.PatientCreateWithoutConversationInput> = makeSchema() as unknown as z.ZodType<Prisma.PatientCreateWithoutConversationInput>;
+export const PatientCreateWithoutConversationInputObjectZodSchema = makeSchema();