feat(examples): add cryptographic and HTTP server examples ✨

- Add salt-hash examples demonstrating crypto operations and key rotation
- Add HTTP server example with JWT authentication and role-based access
- Include comprehensive README documentation for both example categories
- Provide zero-dependency examples using only Node.js built-in modules
- Show real-world integration patterns for Secure-JWT library

Author: NeaByteLab

examples/http-server/README.md

@@ -0,0 +1,124 @@
+# 🌐 HTTP Server Examples
+
+This directory contains HTTP server examples demonstrating how to use Secure-JWT in real-world scenarios.
+
+## 📚 Examples
+
+### 🚀 Simple Server (`simple-server.ts`)
+
+A complete HTTP server implementation using only Node.js built-in modules - no external dependencies!
+
+**Features:**
+- **Login endpoint** - Authenticate users and issue JWT tokens
+- **Protected endpoints** - Verify JWT tokens for access control
+- **Role-based access** - Admin-only endpoints
+- **Token verification** - Validate existing tokens
+- **Health check** - Server status and JWT configuration
+- **CORS support** - Cross-origin requests
+- **Error handling** - Comprehensive error responses
+
+**Endpoints:**
+- `POST /login` - Login with username/password
+- `GET /protected` - Access protected resource
+- `GET /profile` - Get user profile
+- `GET /admin` - Admin only access
+- `POST /verify` - Verify token
+- `GET /health` - Health check
+
+---
+
+## 🚀 Quick Start
+
+1. **Start the server:**
+   ```bash
+   npx tsx examples/http-server/simple-server.ts
+   ```
+
+2. **Test the endpoints:**
+   ```bash
+   # Login
+   curl -X POST http://localhost:3000/login \
+     -H "Content-Type: application/json" \
+     -d '{"username":"admin","password":"admin123"}'
+
+   # Use the token from login response
+   curl -H "Authorization: Bearer <your-token>" \
+     http://localhost:3000/protected
+   ```
+
+## 👥 Test Users
+
+| Username | Password | Role  |
+|----------|----------|-------|
+| admin    | admin123 | admin |
+| user     | user123  | user  |
+| john     | john123  | user  |
+
+## 🔒 Security Features
+
+- **Authenticated Encryption** - All tokens are encrypted with AES-256-GCM
+- **Key Derivation** - Uses PBKDF2 for secure key generation
+- **Version Control** - Prevents downgrade attacks
+- **Input Validation** - Comprehensive validation at every layer
+- **Error Handling** - Secure error responses without information leakage
+
+## 🏭 Production Considerations
+
+- **Change the secret key** - Use a strong, random secret in production
+- **Use environment variables** - Store secrets securely
+- **Add rate limiting** - Prevent brute force attacks
+- **Use HTTPS** - Encrypt all communications
+- **Add logging** - Monitor authentication events
+- **Database integration** - Replace mock user database
+
+## 📝 Example Responses
+
+### ✅ Login Success
+```json
+{
+  "message": "Login successful",
+  "token": "eyJlbmNyeXB0ZWQiOiI...",
+  "user": {
+    "userId": 1,
+    "username": "admin",
+    "role": "admin"
+  },
+  "expiresIn": "1h"
+}
+```
+
+### 🔐 Protected Resource Access
+```json
+{
+  "message": "Access granted to protected resource",
+  "user": {
+    "userId": 1,
+    "username": "admin",
+    "role": "admin"
+  },
+  "data": {
+    "users": [...],
+    "stats": {...}
+  }
+}
+```
+
+### ❌ Error Response
+```json
+{
+  "error": "Invalid or expired token",
+  "details": null,
+  "timestamp": "2024-01-15T10:30:00.000Z"
+}
+```
+
+## 💡 Why This Example?
+
+This example demonstrates:
+- **Real-world usage** - How JWT authentication works in practice
+- **Zero dependencies** - Pure Node.js implementation
+- **Security best practices** - Proper token handling and validation
+- **Production patterns** - Error handling, CORS, health checks
+- **Role-based access** - Different permission levels
+
+Perfect for understanding how to integrate Secure-JWT into your applications! 🚀