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)

src/types/skill.ts

@@ -0,0 +1,64 @@
+/**
+ * Skill Type Definitions
+ * Types for skills/plugins
+ */
+
+/**
+ * Skill category
+ */
+export type SkillCategory =
+  | 'productivity'
+  | 'developer'
+  | 'smart-home'
+  | 'media'
+  | 'communication'
+  | 'security'
+  | 'information'
+  | 'utility'
+  | 'custom';
+
+/**
+ * Skill data structure
+ */
+export interface Skill {
+  id: string;
+  name: string;
+  description: string;
+  enabled: boolean;
+  category: SkillCategory;
+  icon?: string;
+  version?: string;
+  author?: string;
+  configurable?: boolean;
+  isCore?: boolean;
+  dependencies?: string[];
+}
+
+/**
+ * Skill bundle (preset skill collection)
+ */
+export interface SkillBundle {
+  id: string;
+  name: string;
+  nameZh: string;
+  description: string;
+  descriptionZh: string;
+  icon: string;
+  skills: string[];
+  recommended?: boolean;
+}
+
+/**
+ * Skill configuration schema
+ */
+export interface SkillConfigSchema {
+  type: 'object';
+  properties: Record<string, {
+    type: 'string' | 'number' | 'boolean' | 'array';
+    title?: string;
+    description?: string;
+    default?: unknown;
+    enum?: unknown[];
+  }>;
+  required?: string[];
+}