feat: scaffold monorepo with shared types and NestJS server

- pnpm workspace with packages/app, packages/server, packages/shared
- @mp-pilates/shared: enums, constants, TypeScript interfaces for all 8 data models
- @mp-pilates/server: NestJS bootstrap with health check, validation pipe, CORS
- Base TypeScript config with strict mode

packages/shared/src/enums.ts

@@ -0,0 +1,46 @@
+// ===== User =====
+export enum UserRole {
+  MEMBER = 'MEMBER',
+  ADMIN = 'ADMIN',
+}
+
+// ===== CardType =====
+export enum CardTypeCategory {
+  TIMES = 'TIMES',
+  DURATION = 'DURATION',
+  TRIAL = 'TRIAL',
+}
+
+// ===== Membership =====
+export enum MembershipStatus {
+  ACTIVE = 'ACTIVE',
+  EXPIRED = 'EXPIRED',
+  USED_UP = 'USED_UP',
+}
+
+// ===== TimeSlot =====
+export enum TimeSlotStatus {
+  OPEN = 'OPEN',
+  FULL = 'FULL',
+  CLOSED = 'CLOSED',
+}
+
+export enum TimeSlotSource {
+  TEMPLATE = 'TEMPLATE',
+  MANUAL = 'MANUAL',
+}
+
+// ===== Booking =====
+export enum BookingStatus {
+  CONFIRMED = 'CONFIRMED',
+  CANCELLED = 'CANCELLED',
+  COMPLETED = 'COMPLETED',
+  NO_SHOW = 'NO_SHOW',
+}
+
+// ===== Order =====
+export enum OrderStatus {
+  PENDING = 'PENDING',
+  PAID = 'PAID',
+  REFUNDED = 'REFUNDED',
+}