docs: update search-layer dep to v2.1 with Grok source

fix: enforce GitHub API over web_fetch for SPA pages

docs: update redirect notice

docs: redirect to monorepo + preserve full original README

docs: redirect to openclaw-skills monorepo

docs: update README for search-layer v2 integration

feat: upgrade search-layer calls to v2 intent-aware API

docs: update deps to point to openclaw-search-skills repo

Update README to focus on project features

📖 README: 依赖信息前置到快速开始之后

🐛 修复 Telegram 吞空行问题

🔒 新增输出自检清单（强制）

📝 报告标题必须链接到 GitHub 仓库

🔧 对齐最新 skills 协议

✨ Initial commit: GitHub Explorer skill for OpenClaw