🚀 Major upgrade: Convert to Node.js architecture with Netlify Functions

🔄 Complete Architecture Transformation:
- Migrated from PHP to Node.js backend
- Implemented Netlify Functions for serverless deployment
- Added Express.js server for local development
- Full compatibility with modern deployment platforms

🛠️ New Netlify Functions:
- giffgaff-mfa-challenge.js: Handles MFA email verification with proper headers
- giffgaff-mfa-validation.js: Processes MFA code validation
- verify-cookie.js: Cookie authentication converted from PHP to Node.js

✅ MFA 403 Error Resolution:
- Proper Origin and Referer headers in server-side requests
- Comprehensive error logging for debugging
- Timeout handling and robust error responses
- Should completely resolve MFA authentication issues

🍪 Enhanced Cookie Login:
- Full Node.js implementation replacing PHP dependency
- Works on all deployment platforms (Netlify, Vercel, traditional servers)
- Intelligent cookie parsing and validation
- Secure API calls with proper headers

�� Development Experience:
- package.json with all necessary dependencies
- Local development server (server.js)
- Environment configuration (env.example)
- Hot reload support with nodemon

🌐 Deployment Improvements:
- Netlify Functions integration
- Updated netlify.toml configuration
- Automatic dependency installation
- Zero-config deployment process

🎯 Key Benefits:
- ✅ Resolves MFA 403 errors through proper server-side handling
- ✅ Cookie login works on all platforms (no PHP dependency)
- ✅ Better error handling and logging
- ✅ Modern serverless architecture
- ✅ Improved development experience
- ✅ Full compatibility with static hosting platforms

📋 Technical Stack:
- Frontend: Pure HTML/CSS/JavaScript (unchanged)
- Backend: Node.js + Express.js (local) / Netlify Functions (production)
- Dependencies: axios, cors, helmet, morgan, dotenv
- Deployment: Netlify with automatic function deployment

This major upgrade modernizes the entire backend architecture while maintaining full frontend compatibility. The MFA 403 error should now be completely resolved through proper server-side request handling.

package.json

@@ -1,25 +1,44 @@
 {
   "name": "esim-tools",
-  "version": "1.0.0",
-  "description": "专为Giffgaff和Simyo用户设计的eSIM管理工具集，支持完整的eSIM申请、设备更换和二维码生成流程",
-  "main": "simyo_proxy_server.js",
+  "version": "2.0.0",
+  "description": "专为Giffgaff和Simyo用户设计的eSIM管理工具集",
+  "main": "index.js",
   "scripts": {
-    "start": "node simyo_proxy_server.js",
-    "dev": "nodemon simyo_proxy_server.js",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "start": "node server.js",
+    "dev": "nodemon server.js",
+    "build": "echo 'Static build - no build needed'",
+    "test": "echo 'Tests will be added soon'",
+    "netlify-dev": "netlify dev",
+    "deploy": "netlify deploy --prod"
   },
   "keywords": [
     "esim",
     "giffgaff",
     "simyo",
-    "proxy",
-    "cors",
-    "api",
     "mobile",
-    "telecom"
+    "sim-card",
+    "oauth",
+    "api"
   ],
-  "author": "Silentely",
+  "author": "eSIM Tools Team",
   "license": "MIT",
+  "dependencies": {
+    "express": "^4.18.2",
+    "cors": "^2.8.5",
+    "axios": "^1.6.2",
+    "cookie-parser": "^1.4.6",
+    "helmet": "^7.1.0",
+    "morgan": "^1.10.0",
+    "dotenv": "^16.3.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.2",
+    "netlify-cli": "^17.10.1"
+  },
+  "engines": {
+    "node": ">=18.0.0",
+    "npm": ">=8.0.0"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/Silentely/esim-tools.git"
@@ -27,16 +46,5 @@
   "bugs": {
     "url": "https://github.com/Silentely/esim-tools/issues"
   },
-  "homepage": "https://github.com/Silentely/esim-tools#readme",
-  "dependencies": {
-    "express": "^4.18.2",
-    "cors": "^2.8.5",
-    "node-fetch": "^2.7.0"
-  },
-  "devDependencies": {
-    "nodemon": "^3.0.1"
-  },
-  "engines": {
-    "node": ">=14.0.0"
-  }
+  "homepage": "https://esim.cosr.eu.org"
 }