Add OpenClaw local and Mac mini setup skill

infrastructure/platforms/convex-backend/SKILL.md

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+---
+name: convex-backend
+description: Build reactive backends with Convex functions, schema validation, auth integration, and deployment workflows.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# Convex Backend
+
+Use Convex to build type-safe backend logic with realtime data sync.
+
+## Quick Start
+
+```bash
+npm install convex
+npx convex dev
+npx convex deploy
+```
+
+## Implementation Tips
+
+- Define schema and validation before writing functions.
+- Keep mutations idempotent where possible.
+- Use auth identity checks in every privileged query/mutation.
+- Add indexing early for high-read collections.
+
+## Related Skills
+
+- [firebase-app-platform](../firebase-app-platform/) - Alternative managed backend
+- [agent-observability](../../../devops/ai/agent-observability/) - Instrument AI-driven backend flows