Add lessons domain Phase 1: instructor and lesson type entities

Foundation tables for the lessons module with full CRUD, pagination,
search, and sorting. Includes migration, Drizzle schema, Zod validation,
services, routes, and 23 integration tests.

packages/shared/src/schemas/index.ts

@@ -99,3 +99,17 @@ export type {
   RepairServiceTemplateCreateInput,
   RepairServiceTemplateUpdateInput,
 } from './repairs.schema.js'
+
+export {
+  LessonFormat,
+  InstructorCreateSchema,
+  InstructorUpdateSchema,
+  LessonTypeCreateSchema,
+  LessonTypeUpdateSchema,
+} from './lessons.schema.js'
+export type {
+  InstructorCreateInput,
+  InstructorUpdateInput,
+  LessonTypeCreateInput,
+  LessonTypeUpdateInput,
+} from './lessons.schema.js'