chore: migrate domain references from coco.xyz to icoco.ai

[owen0x6f]

Summary

• Replaces all domain references from coco.xyz to icoco.ai across the Hugo site (22 files, 66 replacements)
• Follows uniform subdomain mapping: xxx.coco.xyz → xxx.icoco.ai
• Covers: coco.xyz, labs.coco.xyz, api.coco.xyz, connect.coco.xyz, docs.coco.xyz, service@coco.xyz, contact@coco.xyz
• No git.coco.xyz references existed in the repo, so no exclusions were needed

Scope

Part of the domain migration from coco.xyz to icoco.ai. This PR covers site content and config changes — DNS and infrastructure changes are handled separately.

Files changed

• Config: hugo.yaml, static/CNAME
• Content: content/clawmark/, content/hxa-connect/
• Layouts: layouts/partials/ (footer, head, home)
• Static: static/llms.txt, static/robots.txt, static/.well-known/ai-plugin.json, static/clawmark/dashboard/
• i18n: i18n/en.yaml, i18n/zh-cn.yaml
• CSS: assets/css/custom.css, assets/css/schemes/coco.css
• Docs: README.md

Test plan

• Verify Hugo site builds without errors (hugo)
• Check all internal links point to icoco.ai
• Verify CNAME file updated to labs.icoco.ai
• Verify baseURL in hugo.yaml is https://labs.icoco.ai/
• Spot-check sitemap and robots.txt URLs

🤖 Generated with Claude Code

[Nanyan]

域名迁移 coco.xyz → icoco.ai，22 文件 66 处替换，EN/ZH 对称更新。

Config (hugo.yaml, CNAME)、content (ClawMark, HxA Connect)、layouts (JSON-LD, footer, hero)、static (ai-plugin.json, robots.txt, llms.txt)、i18n 全部一致。

建议（非阻塞）：

1. static/clawmark/dashboard/assets/index-C7PTYzv5.js 是手动改 minified bundle —— 替换本身正确（api.coco.xyz → api.icoco.ai），但建议确认 ClawMark dashboard 源码的 .env / vite.config 也已更新，避免下次 rebuild 回退
2. extend-head.html JSON-LD logo URL 指向 icoco.ai/coco-b.svg，确认资源已部署
3. 合并后跑一遍 grep -r "coco\.xyz" 确保无遗漏

LGTM ✅