feat: add GitHub Copilot support (#17)

- Add .github/prompts/ui-ux-pro-max.prompt.md for Copilot
- Add 'copilot' as new AI type in CLI
- Update detect utility to recognize .github folder
- Update CLAUDE.md sync rules with .github
- Update README with Copilot installation and usage
- Bump version to 1.2.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "uipro-cli",
-  "version": "1.1.1",
+  "version": "1.2.0",
   "description": "CLI to install UI/UX Pro Max skill for AI coding assistants",
   "type": "module",
   "bin": {
@@ -22,6 +22,7 @@
     "claude",
     "cursor",
     "windsurf",
+    "copilot",
     "ai",
     "skill"
   ],