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/PatientOrderByWithRelationInput.schema.ts

@@ -9,7 +9,8 @@ import { ClaimOrderByRelationAggregateInputObjectSchema as ClaimOrderByRelationA
 import { PdfGroupOrderByRelationAggregateInputObjectSchema as PdfGroupOrderByRelationAggregateInputObjectSchema } from './PdfGroupOrderByRelationAggregateInput.schema';
 import { PaymentOrderByRelationAggregateInputObjectSchema as PaymentOrderByRelationAggregateInputObjectSchema } from './PaymentOrderByRelationAggregateInput.schema';
 import { CommunicationOrderByRelationAggregateInputObjectSchema as CommunicationOrderByRelationAggregateInputObjectSchema } from './CommunicationOrderByRelationAggregateInput.schema';
-import { PatientDocumentOrderByRelationAggregateInputObjectSchema as PatientDocumentOrderByRelationAggregateInputObjectSchema } from './PatientDocumentOrderByRelationAggregateInput.schema'
+import { PatientDocumentOrderByRelationAggregateInputObjectSchema as PatientDocumentOrderByRelationAggregateInputObjectSchema } from './PatientDocumentOrderByRelationAggregateInput.schema';
+import { PatientConversationOrderByWithRelationInputObjectSchema as PatientConversationOrderByWithRelationInputObjectSchema } from './PatientConversationOrderByWithRelationInput.schema'
 
 const makeSchema = () => z.object({
   id: SortOrderSchema.optional(),
@@ -40,7 +41,8 @@ const makeSchema = () => z.object({
   groups: z.lazy(() => PdfGroupOrderByRelationAggregateInputObjectSchema).optional(),
   payment: z.lazy(() => PaymentOrderByRelationAggregateInputObjectSchema).optional(),
   communications: z.lazy(() => CommunicationOrderByRelationAggregateInputObjectSchema).optional(),
-  documents: z.lazy(() => PatientDocumentOrderByRelationAggregateInputObjectSchema).optional()
+  documents: z.lazy(() => PatientDocumentOrderByRelationAggregateInputObjectSchema).optional(),
+  conversation: z.lazy(() => PatientConversationOrderByWithRelationInputObjectSchema).optional()
 }).strict();
 export const PatientOrderByWithRelationInputObjectSchema: z.ZodType<Prisma.PatientOrderByWithRelationInput> = makeSchema() as unknown as z.ZodType<Prisma.PatientOrderByWithRelationInput>;
 export const PatientOrderByWithRelationInputObjectZodSchema = makeSchema();