Initial commit: Telegram Management System

Full-stack web application for Telegram management
- Frontend: Vue 3 + Vben Admin
- Backend: NestJS
- Features: User management, group broadcast, statistics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

marketing-agent/services/billing-service/.env.example

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+# Environment
+NODE_ENV=development
+PORT=3010
+
+# MongoDB
+MONGODB_URI=mongodb://localhost:27017/billing
+
+# Stripe (Get these from https://dashboard.stripe.com/apikeys)
+STRIPE_SECRET_KEY=sk_test_...
+STRIPE_PUBLISHABLE_KEY=pk_test_...
+STRIPE_WEBHOOK_SECRET=whsec_...
+
+# JWT
+JWT_SECRET=your-secret-key-here
+
+# Redis
+REDIS_URL=redis://localhost:6379
+
+# Email
+EMAIL_PROVIDER=sendgrid
+EMAIL_API_KEY=SG...
+EMAIL_FROM=billing@company.com
+
+# CORS
+CORS_ORIGIN=http://localhost:8080,http://localhost:3000
+
+# Rate Limiting
+RATE_LIMIT_WINDOW_MS=900000
+RATE_LIMIT_MAX=100