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/trpc.md

@@ -0,0 +1,41 @@
+# tRPC Principles
+
+> End-to-end type safety for TypeScript monorepos.
+
+## When to Use
+
+```
+✅ Perfect fit:
+├── TypeScript on both ends
+├── Monorepo structure
+├── Internal tools
+├── Rapid development
+└── Type safety critical
+
+❌ Poor fit:
+├── Non-TypeScript clients
+├── Public API
+├── Need REST conventions
+└── Multiple language backends
+```
+
+## Key Benefits
+
+```
+Why tRPC:
+├── Zero schema maintenance
+├── End-to-end type inference
+├── IDE autocomplete across stack
+├── Instant API changes reflected
+└── No code generation step
+```
+
+## Integration Patterns
+
+```
+Common setups:
+├── Next.js + tRPC (most common)
+├── Monorepo with shared types
+├── Remix + tRPC
+└── Any TS frontend + backend
+```