Add 5 OpenClaw skills by FullStackCrew

[fullstackcrew-alpha]

New Skills

Adding 5 production-ready OpenClaw/Claude Code skills:

• Overnight Worker — Autonomous overnight work agent
• Cost Optimizer — Save 60-80% on token costs
• DevOps Agent — One-click DevOps assistant
• CN Content Matrix — Chinese multi-platform content generator
• Smart PR Review — Opinionated AI code reviewer

All skills are published on ClawHub and have full documentation with bilingual (EN/CN) READMEs.

Published by FullStackCrew.

[hesreallyhim]

⚠️ Resource submissions are not accepted via pull request

Resource recommendations must be submitted through the issue template, not as a pull request. The entire resource pipeline — validation, review, and merging — is managed by automation.

To submit your resource correctly:

1. 📖 Read CONTRIBUTING.md
2. 📝 Submit using the official template

If this PR is not a resource submission (e.g., a bug fix or improvement), please comment below and we'll reopen it.

A cooldown of 7 days has been applied to this account.

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