fix(docs): use base '/' for custom domain and add CNAME file (#129)

- Change VitePress base from '/opencli/' to '/' for custom domain opencli.info
- Add docs/public/CNAME so GitHub Pages preserves custom domain on re-deploy

docs/.vitepress/config.mts

@@ -1,7 +1,7 @@
 import { defineConfig } from 'vitepress'
 
 export default defineConfig({
-  base: '/opencli/',
+  base: '/',
   title: 'OpenCLI',
   description: 'Make any website or Electron App your CLI — AI-powered, account-safe, self-healing.',
 

docs/public/CNAME

@@ -0,0 +1 @@
+opencli.info