feat: AI chat system with LangGraph, multi-step patient flows, and appointment rescheduling

- Add floating chat window Hand-off to AI toggle (per-patient) and after-hours AI toggle (global)
- Add LangGraph-powered appointment reminder flow: AI introduces itself, classifies YES/NO, handles confirmation with appointment date/time
- Add multi-step rescheduling flow: ASAP vs next week, tomorrow offer, Mon/Tue/Wed picker, morning/afternoon time slot — automatically updates appointment in DB
- Add new patient / after-hours flow: new vs existing patient, dental insurance check, MassHealth Selenium eligibility check (auto-uses saved member ID + DOB for existing patients), self-pay fallback
- Add AI Chat Settings page (Settings → Advanced) with editable greeting templates and LangGraph flow diagrams for both reminder and new-patient flows
- Add Schedule a New Patient template option in chat window, starts new-patient conversation flow
- Add GET/PUT endpoints for AI handoff, after-hours handoff, and AI chat templates
- Add multilingual support (7 languages) across all AI reply nodes with LLM generation and hardcoded fallbacks
- Add pending reschedule in-memory store and conversation stage tracking across all flows

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

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

@@ -16,7 +16,8 @@ import { TwilioSettingsCreateNestedOneWithoutUserInputObjectSchema as TwilioSett
 import { AiSettingsCreateNestedOneWithoutUserInputObjectSchema as AiSettingsCreateNestedOneWithoutUserInputObjectSchema } from './AiSettingsCreateNestedOneWithoutUserInput.schema';
 import { OfficeHoursCreateNestedOneWithoutUserInputObjectSchema as OfficeHoursCreateNestedOneWithoutUserInputObjectSchema } from './OfficeHoursCreateNestedOneWithoutUserInput.schema';
 import { OfficeContactCreateNestedOneWithoutUserInputObjectSchema as OfficeContactCreateNestedOneWithoutUserInputObjectSchema } from './OfficeContactCreateNestedOneWithoutUserInput.schema';
-import { ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema as ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema } from './ProcedureTimeslotCreateNestedOneWithoutUserInput.schema'
+import { ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema as ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema } from './ProcedureTimeslotCreateNestedOneWithoutUserInput.schema';
+import { InsuranceContactCreateNestedManyWithoutUserInputObjectSchema as InsuranceContactCreateNestedManyWithoutUserInputObjectSchema } from './InsuranceContactCreateNestedManyWithoutUserInput.schema'
 
 const makeSchema = () => z.object({
   username: z.string(),
@@ -39,7 +40,8 @@ const makeSchema = () => z.object({
   aiSettings: z.lazy(() => AiSettingsCreateNestedOneWithoutUserInputObjectSchema).optional(),
   officeHours: z.lazy(() => OfficeHoursCreateNestedOneWithoutUserInputObjectSchema).optional(),
   officeContact: z.lazy(() => OfficeContactCreateNestedOneWithoutUserInputObjectSchema).optional(),
-  procedureTimeslot: z.lazy(() => ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema).optional()
+  procedureTimeslot: z.lazy(() => ProcedureTimeslotCreateNestedOneWithoutUserInputObjectSchema).optional(),
+  insuranceContacts: z.lazy(() => InsuranceContactCreateNestedManyWithoutUserInputObjectSchema).optional()
 }).strict();
 export const UserCreateWithoutCommunicationsInputObjectSchema: z.ZodType<Prisma.UserCreateWithoutCommunicationsInput> = makeSchema() as unknown as z.ZodType<Prisma.UserCreateWithoutCommunicationsInput>;
 export const UserCreateWithoutCommunicationsInputObjectZodSchema = makeSchema();