Create .env.example

.env.example

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+# ===== BUILD-TIME VARIABLES =====
+# These are baked into the frontend at build time
+
+# API URL (relative path for same-origin, or full URL for external)
+# Same server (with proxy):  /api
+# Remote server (direct):    https://api.yourbot.com/cabinet
+VITE_API_URL=/api
+
+# Telegram bot username for Login Widget (without @)
+VITE_TELEGRAM_BOT_USERNAME=your_bot_username
+
+# ===== BRANDING =====
+# App name displayed in header and browser tab
+VITE_APP_NAME=VPN Cabinet
+
+# Short logo text (1-2 characters, displayed in logo icon)
+VITE_APP_LOGO=V
+
+# ===== RUNTIME VARIABLES =====
+# These are used by Caddy at runtime
+
+# Backend URL for reverse proxy (only if using proxy mode with VITE_API_URL=/api)
+# Development:               http://host.docker.internal:8080
+# Production (same network): http://remnawave_bot:8080
+# Remote server:             https://api.yourbot.com
+BACKEND_URL=https://api.yourbot.com
+
+# Port to expose the frontend
+CABINET_PORT=3000
+
+# ===== PRODUCTION ONLY =====
+
+# Domain for HTTPS (Caddy will auto-obtain certificates)
+DOMAIN=cabinet.yourdomain.com
+
+# HTTPS port (usually 443)
+CABINET_HTTPS_PORT=443