feat(db): v4 migration + shared types for specialist auto-assignment

Adds auto_assign_specialist + working_hours to businesses, and specialties + working_hours + efficiency_score to employees, with idempotent migrateV3ToV4 (backfills default Lun-Vie 09:00-20:00 working hours). Updates Business/Employee types and adds WorkingHoursMap.

shared/types.ts

@@ -14,9 +14,20 @@ export interface Business {
   status?: string;
   template?: string | null;
   trial_ends_at?: string | null;
+  booking_enabled?: number | boolean;
+  cancel_window_hours?: number;
+  cancel_penalty_pct?: number;
+  require_deposit?: number | boolean;
+  deposit_pct?: number;
+  timezone?: string;
+  auto_assign_specialist?: number | boolean;
+  working_hours?: WorkingHoursMap | string | null;
   created_at?: string;
 }
 
+export type WorkingDay = { start: string; end: string };
+export type WorkingHoursMap = Record<number, WorkingDay | null>; // 1=Lun … 7=Dom
+
 export interface User {
   id: number;
   business_id: number | null;
@@ -39,6 +50,9 @@ export interface Employee {
   rating: number;
   hire_date: string | null;
   service_ids?: number[];
+  specialties?: string[];
+  working_hours?: WorkingHoursMap | string | null;
+  efficiency_score?: number;
   stats?: EmployeeStats;
 }