feat: Complete zCode CLI X with Telegram bot integration

- Add full Telegram bot functionality with Z.AI API integration
- Implement 4 tools: Bash, FileEdit, WebSearch, Git
- Add 3 agents: Code Reviewer, Architect, DevOps Engineer
- Add 6 skills for common coding tasks
- Add systemd service file for 24/7 operation
- Add nginx configuration for HTTPS webhook
- Add comprehensive documentation
- Implement WebSocket server for real-time updates
- Add logging system with Winston
- Add environment validation

🤖 zCode CLI X - Agentic coder with Z.AI + Telegram integration

src/utils/env.js

@@ -0,0 +1,25 @@
+import { logger } from './logger.js';
+
+export function checkEnv() {
+  const required = [
+    'ZAI_API_KEY',
+    'GLM_BASE_URL',
+  ];
+
+  const missing = [];
+
+  for (const key of required) {
+    if (!process.env[key]) {
+      missing.push(key);
+    }
+  }
+
+  return {
+    valid: missing.length === 0,
+    missing,
+    ZAI_API_KEY: process.env.ZAI_API_KEY || '',
+    GLM_BASE_URL: process.env.GLM_BASE_URL || '',
+    TELEGRAM_BOT_TOKEN: process.env.TELEGRAM_BOT_TOKEN || '',
+    TELEGRAM_ALLOWED_USERS: process.env.TELEGRAM_ALLOWED_USERS || '',
+  };
+}