feat: add uxpro-cli for easy skill installation (#4)

* feat: add uxpro-cli for easy skill installation

- Add CLI tool (uxpro-cli) with commands: init, versions, update
- Support multiple AI assistants: claude, cursor, windsurf, antigravity, all
- Update README with CLI installation guide and usage examples
- Add CC BY-NC 4.0 license
- Update feature counts to accurate numbers

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

Co-Authored-By: Claude <noreply@anthropic.com>

* refactor: rename CLI from uxpro to uipro

- Package: uxpro-cli -> uipro-cli
- Command: uxpro -> uipro

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

Co-Authored-By: Claude <noreply@anthropic.com>

---------

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

cli/src/utils/github.ts

@@ -0,0 +1,59 @@
+import type { Release } from '../types/index.js';
+
+const REPO_OWNER = 'nextlevelbuilder';
+const REPO_NAME = 'ui-ux-pro-max-skill';
+const API_BASE = 'https://api.github.com';
+
+export async function fetchReleases(): Promise<Release[]> {
+  const url = `${API_BASE}/repos/${REPO_OWNER}/${REPO_NAME}/releases`;
+
+  const response = await fetch(url, {
+    headers: {
+      'Accept': 'application/vnd.github.v3+json',
+      'User-Agent': 'uipro-cli',
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to fetch releases: ${response.statusText}`);
+  }
+
+  return response.json();
+}
+
+export async function getLatestRelease(): Promise<Release> {
+  const url = `${API_BASE}/repos/${REPO_OWNER}/${REPO_NAME}/releases/latest`;
+
+  const response = await fetch(url, {
+    headers: {
+      'Accept': 'application/vnd.github.v3+json',
+      'User-Agent': 'uipro-cli',
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to fetch latest release: ${response.statusText}`);
+  }
+
+  return response.json();
+}
+
+export async function downloadRelease(url: string, dest: string): Promise<void> {
+  const response = await fetch(url, {
+    headers: {
+      'User-Agent': 'uipro-cli',
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to download: ${response.statusText}`);
+  }
+
+  const buffer = await response.arrayBuffer();
+  await Bun.write(dest, buffer);
+}
+
+export function getAssetUrl(release: Release): string | null {
+  const asset = release.assets.find(a => a.name.endsWith('.zip'));
+  return asset?.browser_download_url ?? null;
+}