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/server/package.json

@@ -0,0 +1,64 @@
+{
+  "name": "@mp-pilates/server",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "build": "nest build",
+    "dev": "nest start --watch",
+    "start": "nest start",
+    "start:prod": "node dist/main",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "prisma:generate": "prisma generate",
+    "prisma:migrate": "prisma migrate dev",
+    "prisma:seed": "ts-node prisma/seed.ts",
+    "lint": "eslint \"{src,test}/**/*.ts\""
+  },
+  "dependencies": {
+    "@mp-pilates/shared": "workspace:*",
+    "@nestjs/common": "^10.4.0",
+    "@nestjs/config": "^3.2.0",
+    "@nestjs/core": "^10.4.0",
+    "@nestjs/jwt": "^10.2.0",
+    "@nestjs/passport": "^10.0.3",
+    "@nestjs/platform-express": "^10.4.0",
+    "@nestjs/schedule": "^4.1.0",
+    "@prisma/client": "^5.19.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
+    "passport": "^0.7.0",
+    "passport-jwt": "^4.0.1",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^10.4.0",
+    "@nestjs/schematics": "^10.1.0",
+    "@nestjs/testing": "^10.4.0",
+    "@types/express": "^4.17.21",
+    "@types/jest": "^29.5.12",
+    "@types/passport-jwt": "^4.0.1",
+    "jest": "^29.7.0",
+    "prisma": "^5.19.0",
+    "source-map-support": "^0.5.21",
+    "supertest": "^7.0.0",
+    "ts-jest": "^29.2.0",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.4.0"
+  },
+  "jest": {
+    "moduleFileExtensions": ["js", "json", "ts"],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": ["**/*.(t|j)s", "!**/*.module.ts", "!main.ts"],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node",
+    "moduleNameMapper": {
+      "^@mp-pilates/shared(.*)$": "<rootDir>/../../shared/src$1"
+    }
+  }
+}