docs: Update documentation for v1.4.0 release

- Update CHANGELOG.md with v1.4.0 release notes
  - Document cloudflare-troubleshooting and ui-designer skills
  - Move unreleased items to v1.4.0 section
  - Add comparison links for v1.3.0 and v1.4.0

- Update CLAUDE.md
  - Change skill count from 8 to 11
  - Add cli-demo-generator, cloudflare-troubleshooting, ui-designer to skills list
  - Update marketplace configuration description

- Update README.md version badge from 1.2.0 to 1.4.0

- Update README.zh-CN.md version badge from 1.2.0 to 1.4.0

All documentation now reflects the complete 11-skill marketplace.

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

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

README.md

@@ -7,7 +7,7 @@
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Skills](https://img.shields.io/badge/skills-11-blue.svg)](https://github.com/daymade/claude-code-skills)
-[![Version](https://img.shields.io/badge/version-1.2.0-green.svg)](https://github.com/daymade/claude-code-skills)
+[![Version](https://img.shields.io/badge/version-1.4.0-green.svg)](https://github.com/daymade/claude-code-skills)
 [![Claude Code](https://img.shields.io/badge/Claude%20Code-2.0.13+-purple.svg)](https://claude.com/code)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](./CONTRIBUTING.md)
 [![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)](https://github.com/daymade/claude-code-skills/graphs/commit-activity)