chore: align Zylos content with OpenClaw ecosystem positioning

[jessie-coco]

Summary

Updates all Zylos-related content across the coco-labs site to emphasize OpenClaw compatibility, per Kevin's directive on ecosystem positioning.

Files changed (8):

• i18n/en.yaml — Section title, zylos_core_desc, and zylos_core_featured_desc updated with OpenClaw references
• i18n/zh-cn.yaml — Chinese equivalents of the above
• content/zylos-core/_index.md — Description, badge, and tagline updated
• content/zylos-core/_index.zh-cn.md — Chinese equivalents of the above
• content/_index.md — Section heading and product table description
• static/llms.txt — Section heading and Zylos Core description for LLM consumption
• static/.well-known/ai-plugin.json — Added "OpenClaw-compatible" to model description
• README.md — Section heading and Zylos table row description

Context

Audit source: ~/zylos/workspace/zylos-oc-audit.md. Kevin directive to align Zylos positioning with the OpenClaw ecosystem.

Test plan

• Verify Hugo builds without errors (hugo server)
• Check English and Chinese pages render correctly
• Confirm llms.txt and ai-plugin.json are well-formed

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