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/app-builder/templates/SKILL.md

@@ -0,0 +1,39 @@
+---
+name: templates
+description: Project scaffolding templates for new applications. Use when creating new projects from scratch. Contains 12 templates for various tech stacks.
+allowed-tools: Read, Glob, Grep
+---
+
+# Project Templates
+
+> Quick-start templates for scaffolding new projects.
+
+---
+
+## 🎯 Selective Reading Rule
+
+**Read ONLY the template matching user's project type!**
+
+| Template | Tech Stack | When to Use |
+|----------|------------|-------------|
+| [nextjs-fullstack](nextjs-fullstack/TEMPLATE.md) | Next.js + Prisma | Full-stack web app |
+| [nextjs-saas](nextjs-saas/TEMPLATE.md) | Next.js + Stripe | SaaS product |
+| [nextjs-static](nextjs-static/TEMPLATE.md) | Next.js + Framer | Landing page |
+| [express-api](express-api/TEMPLATE.md) | Express + JWT | REST API |
+| [python-fastapi](python-fastapi/TEMPLATE.md) | FastAPI | Python API |
+| [react-native-app](react-native-app/TEMPLATE.md) | Expo + Zustand | Mobile app |
+| [flutter-app](flutter-app/TEMPLATE.md) | Flutter + Riverpod | Cross-platform |
+| [electron-desktop](electron-desktop/TEMPLATE.md) | Electron + React | Desktop app |
+| [chrome-extension](chrome-extension/TEMPLATE.md) | Chrome MV3 | Browser extension |
+| [cli-tool](cli-tool/TEMPLATE.md) | Node.js + Commander | CLI app |
+| [monorepo-turborepo](monorepo-turborepo/TEMPLATE.md) | Turborepo + pnpm | Monorepo |
+| [astro-static](astro-static/TEMPLATE.md) | Astro + MDX | Blog / Docs |
+
+---
+
+## Usage
+
+1. User says "create [type] app"
+2. Match to appropriate template
+3. Read ONLY that template's TEMPLATE.md
+4. Follow its tech stack and structure