feat: initialize backend with NestJS, PostgreSQL, and Prisma

- Add package.json for backend dependencies and scripts.
- Create Prisma schema for multi-tenant event management.
- Implement main application module and configure global settings.
- Develop authentication module with JWT and Authentik integration.
- Create DTOs for guest account creation and KC management.
- Implement role-based access control with custom guards and decorators.
- Add services and controllers for managing KCs and guest accounts.
- Set up global validation and CORS in the main application entry point.
- Establish Prisma module for database access throughout the application.
- Document project plan and architecture for multi-tenant platform.

backend/package.json

@@ -0,0 +1,80 @@
+{
+  "name": "backend",
+  "version": "0.0.1",
+  "description": "KC-App backend (NestJS)",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "prisma:generate": "prisma generate",
+    "prisma:migrate": "prisma migrate dev"
+  },
+  "dependencies": {
+    "@nestjs/common": "^10.4.15",
+    "@nestjs/config": "^3.3.0",
+    "@nestjs/core": "^10.4.15",
+    "@nestjs/jwt": "^10.2.0",
+    "@nestjs/passport": "^10.0.3",
+    "@nestjs/platform-express": "^10.4.15",
+    "@nestjs/platform-ws": "^10.4.15",
+    "@nestjs/websockets": "^10.4.15",
+    "@prisma/client": "^5.22.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
+    "jwks-rsa": "^3.1.0",
+    "passport": "^0.7.0",
+    "passport-jwt": "^4.0.1",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "ws": "^8.18.0"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^10.4.9",
+    "@nestjs/schematics": "^10.2.3",
+    "@nestjs/testing": "^10.4.15",
+    "@types/express": "^4.17.21",
+    "@types/jest": "^29.5.14",
+    "@types/node": "^20.17.9",
+    "@types/passport": "^1.0.17",
+    "@types/passport-jwt": "^4.0.1",
+    "@types/supertest": "^6.0.2",
+    "@types/ws": "^8.5.13",
+    "@typescript-eslint/eslint-plugin": "^7.18.0",
+    "@typescript-eslint/parser": "^7.18.0",
+    "eslint": "^8.57.1",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.2.1",
+    "jest": "^29.7.0",
+    "prettier": "^3.4.2",
+    "prisma": "^5.22.0",
+    "source-map-support": "^0.5.21",
+    "supertest": "^6.3.4",
+    "ts-jest": "^29.2.5",
+    "ts-loader": "^9.5.1",
+    "ts-node": "^10.9.2",
+    "tsconfig-paths": "^4.2.0",
+    "typescript": "^5.6.3"
+  },
+  "jest": {
+    "moduleFileExtensions": ["js", "json", "ts"],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": ["**/*.(t|j)s"],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
+}