feat: add 33 skills from vudovn/antigravity-kit

- Added: api-patterns, app-builder, architecture, bash-linux, behavioral-modes,
  clean-code, code-review-checklist, database-design, deployment-procedures,
  docker-expert, documentation-templates, game-development, geo-fundamentals,
  i18n-localization, lint-and-validate, mobile-design, nestjs-expert,
  nextjs-best-practices, nodejs-best-practices, parallel-agents,
  performance-profiling, plan-writing, powershell-windows, prisma-expert,
  python-patterns, react-patterns, red-team-tactics, seo-fundamentals,
  server-management, tailwind-patterns, tdd-workflow, typescript-expert,
  vulnerability-scanner
- Updated README: skill count 179 → 223
- Added credit for vudovn/antigravity-kit (MIT License)

Source: https://github.com/vudovn/antigravity-kit

skills/api-patterns/versioning.md

@@ -0,0 +1,22 @@
+# Versioning Strategies
+
+> Plan for API evolution from day one.
+
+## Decision Factors
+
+| Strategy | Implementation | Trade-offs |
+|----------|---------------|------------|
+| **URI** | /v1/users | Clear, easy caching |
+| **Header** | Accept-Version: 1 | Cleaner URLs, harder discovery |
+| **Query** | ?version=1 | Easy to add, messy |
+| **None** | Evolve carefully | Best for internal, risky for public |
+
+## Versioning Philosophy
+
+```
+Consider:
+├── Public API? → Version in URI
+├── Internal only? → May not need versioning
+├── GraphQL? → Typically no versions (evolve schema)
+├── tRPC? → Types enforce compatibility
+```