Add REST API layer with HTTP endpoints and WebSocket support

apps/frontend/.env.example

@@ -36,6 +36,24 @@
 # Note: The Electron app will read these from process.env
 # The Python backend (auto-claude) has its own .env file
 
+# ============================================
+# API SERVER SETTINGS
+# ============================================
+
+# Port for the REST API server
+# Default: 3456
+# API_PORT=3456
+
+# Host/IP address for the API server to bind to
+# Use 127.0.0.1 for local-only access, 0.0.0.0 for all interfaces
+# Default: 127.0.0.1
+# API_HOST=127.0.0.1
+
+# API key for authentication (required for remote access)
+# Generate a secure random key for production use
+# If not set, API authentication is disabled (local development only)
+# API_KEY=your-secure-api-key-here
+
 # ============================================
 # DEVELOPMENT
 # ============================================