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/UserOrderByWithRelationInput.schema.ts

@@ -19,7 +19,8 @@ import { AiSettingsOrderByWithRelationInputObjectSchema as AiSettingsOrderByWith
 import { OfficeHoursOrderByWithRelationInputObjectSchema as OfficeHoursOrderByWithRelationInputObjectSchema } from './OfficeHoursOrderByWithRelationInput.schema';
 import { OfficeContactOrderByWithRelationInputObjectSchema as OfficeContactOrderByWithRelationInputObjectSchema } from './OfficeContactOrderByWithRelationInput.schema';
 import { ProcedureTimeslotOrderByWithRelationInputObjectSchema as ProcedureTimeslotOrderByWithRelationInputObjectSchema } from './ProcedureTimeslotOrderByWithRelationInput.schema';
-import { InsuranceContactOrderByRelationAggregateInputObjectSchema as InsuranceContactOrderByRelationAggregateInputObjectSchema } from './InsuranceContactOrderByRelationAggregateInput.schema'
+import { InsuranceContactOrderByRelationAggregateInputObjectSchema as InsuranceContactOrderByRelationAggregateInputObjectSchema } from './InsuranceContactOrderByRelationAggregateInput.schema';
+import { PatientConversationOrderByRelationAggregateInputObjectSchema as PatientConversationOrderByRelationAggregateInputObjectSchema } from './PatientConversationOrderByRelationAggregateInput.schema'
 
 const makeSchema = () => z.object({
   id: SortOrderSchema.optional(),
@@ -45,7 +46,8 @@ const makeSchema = () => z.object({
   officeHours: z.lazy(() => OfficeHoursOrderByWithRelationInputObjectSchema).optional(),
   officeContact: z.lazy(() => OfficeContactOrderByWithRelationInputObjectSchema).optional(),
   procedureTimeslot: z.lazy(() => ProcedureTimeslotOrderByWithRelationInputObjectSchema).optional(),
-  insuranceContacts: z.lazy(() => InsuranceContactOrderByRelationAggregateInputObjectSchema).optional()
+  insuranceContacts: z.lazy(() => InsuranceContactOrderByRelationAggregateInputObjectSchema).optional(),
+  patientConversations: z.lazy(() => PatientConversationOrderByRelationAggregateInputObjectSchema).optional()
 }).strict();
 export const UserOrderByWithRelationInputObjectSchema: z.ZodType<Prisma.UserOrderByWithRelationInput> = makeSchema() as unknown as z.ZodType<Prisma.UserOrderByWithRelationInput>;
 export const UserOrderByWithRelationInputObjectZodSchema = makeSchema();