feat: add OpenClaw landing page

[Skeyelab]

Summary

• Add /openclaw landing page tailored to OpenClaw webhook relay workflows
• Include setup snippet, OpenClaw-specific delivery path copy, and reused dark navy/cyan landing styling
• Add a contextual /openclaw entry point from the main landing page

Test plan

• yarn test:run
• yarn lint
• DATABASE_URL=postgresql://user:pass@localhost:5432/clawproxy ENCRYPTION_KEY=0000000000000000000000000000000000000000000000000000000000000000 yarn build

Note: plain yarn build requires DATABASE_URL; the env-backed build above completed successfully.

[strix-security]

Strix Security Review

Warning

This pull request has 1 commit after the last Strix review (ee64c8c). Strix has not reviewed these changes.
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No security issues found.

Review summary

This PR adds a static OpenClaw landing page (/openclaw), a contextual link from the main landing page, and corresponding copy tests. All added code is compile-time static JSX with hardcoded strings and standard Next.js Link/Button components. There is no user-controlled input, no dynamic data flow into a dangerous sink, no authentication/authorization changes, no committed secrets (the cpn_your_node_token string is an illustrative placeholder), and no removed security controls. No security issues were identified in the changed code.

_{Updated for ee64c8c.}

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Reviewed by Strix
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