feat(openclaw): support tenant routing headers

[yeyitech]

Summary

• add accountId and userId to the OpenClaw plugin config/schema with env fallback support
• pass tenant headers through the plugin client so remote and local modes can target non-default tenants correctly
• document and test tenant-aware routing for config parsing, client headers, and slash-command search flow

Testing

• npm test -- tests/ut/config.test.ts tests/ut/client.test.ts tests/ut/tools.test.ts
• npm test

Closes #1216

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 1216 - Fully compliant Compliant requirements: Extend plugin config with accountId and userId Pass these values as X-OpenViking-Account and X-OpenViking-User headers Update plugin config schema Allow env fallback for accountId and userId

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🏅 Score: 95

🧪 PR contains tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

[github-actions]

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