feat(core): initialize project skeleton with Electron + React + TypeScript

Set up the complete project foundation for ClawX, a graphical AI assistant:

- Electron main process with IPC handlers, menu, tray, and gateway management
- React renderer with routing, layout components, and page scaffolding
- Zustand state management for gateway, settings, channels, skills, chat, and cron
- shadcn/ui components with Tailwind CSS and CSS variable theming
- Build tooling with Vite, electron-builder, and TypeScript configuration
- Testing setup with Vitest and Playwright
- Development configurations (ESLint, Prettier, gitignore, env example)

electron/utils/config.ts

@@ -0,0 +1,84 @@
+/**
+ * Application Configuration
+ * Centralized configuration constants and helpers
+ */
+
+/**
+ * Port configuration
+ */
+export const PORTS = {
+  /** ClawX GUI development server port */
+  CLAWX_DEV: 5173,
+  
+  /** ClawX GUI production port (for reference) */
+  CLAWX_GUI: 23333,
+  
+  /** OpenClaw Gateway port */
+  OPENCLAW_GATEWAY: 18789,
+} as const;
+
+/**
+ * Get port from environment or default
+ */
+export function getPort(key: keyof typeof PORTS): number {
+  const envKey = `CLAWX_PORT_${key}`;
+  const envValue = process.env[envKey];
+  return envValue ? parseInt(envValue, 10) : PORTS[key];
+}
+
+/**
+ * Application paths
+ */
+export const APP_PATHS = {
+  /** OpenClaw configuration directory */
+  OPENCLAW_CONFIG: '~/.openclaw',
+  
+  /** ClawX configuration directory */
+  CLAWX_CONFIG: '~/.clawx',
+  
+  /** Log files directory */
+  LOGS: '~/.clawx/logs',
+} as const;
+
+/**
+ * Update channels
+ */
+export const UPDATE_CHANNELS = ['stable', 'beta', 'dev'] as const;
+export type UpdateChannel = (typeof UPDATE_CHANNELS)[number];
+
+/**
+ * Default update configuration
+ */
+export const UPDATE_CONFIG = {
+  /** Check interval in milliseconds (6 hours) */
+  CHECK_INTERVAL: 6 * 60 * 60 * 1000,
+  
+  /** Default update channel */
+  DEFAULT_CHANNEL: 'stable' as UpdateChannel,
+  
+  /** Auto download updates */
+  AUTO_DOWNLOAD: false,
+  
+  /** Show update notifications */
+  SHOW_NOTIFICATION: true,
+};
+
+/**
+ * Gateway configuration
+ */
+export const GATEWAY_CONFIG = {
+  /** WebSocket reconnection delay (ms) */
+  RECONNECT_DELAY: 5000,
+  
+  /** RPC call timeout (ms) */
+  RPC_TIMEOUT: 30000,
+  
+  /** Health check interval (ms) */
+  HEALTH_CHECK_INTERVAL: 30000,
+  
+  /** Maximum startup retries */
+  MAX_STARTUP_RETRIES: 30,
+  
+  /** Startup retry interval (ms) */
+  STARTUP_RETRY_INTERVAL: 1000,
+};