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/architecture/examples.md

@@ -0,0 +1,94 @@
+# Architecture Examples
+
+> Real-world architecture decisions by project type.
+
+---
+
+## Example 1: MVP E-commerce (Solo Developer)
+
+```yaml
+Requirements:
+  - <1000 users initially
+  - Solo developer
+  - Fast to market (8 weeks)
+  - Budget-conscious
+
+Architecture Decisions:
+  App Structure: Monolith (simpler for solo)
+  Framework: Next.js (full-stack, fast)
+  Data Layer: Prisma direct (no over-abstraction)
+  Authentication: JWT (simpler than OAuth)
+  Payment: Stripe (hosted solution)
+  Database: PostgreSQL (ACID for orders)
+
+Trade-offs Accepted:
+  - Monolith → Can't scale independently (team doesn't justify it)
+  - No Repository → Less testable (simple CRUD doesn't need it)
+  - JWT → No social login initially (can add later)
+
+Future Migration Path:
+  - Users > 10K → Extract payment service
+  - Team > 3 → Add Repository pattern
+  - Social login requested → Add OAuth
+```
+
+---
+
+## Example 2: SaaS Product (5-10 Developers)
+
+```yaml
+Requirements:
+  - 1K-100K users
+  - 5-10 developers
+  - Long-term (12+ months)
+  - Multiple domains (billing, users, core)
+
+Architecture Decisions:
+  App Structure: Modular Monolith (team size optimal)
+  Framework: NestJS (modular by design)
+  Data Layer: Repository pattern (testing, flexibility)
+  Domain Model: Partial DDD (rich entities)
+  Authentication: OAuth + JWT
+  Caching: Redis
+  Database: PostgreSQL
+
+Trade-offs Accepted:
+  - Modular Monolith → Some module coupling (microservices not justified)
+  - Partial DDD → No full aggregates (no domain experts)
+  - RabbitMQ later → Initial synchronous (add when proven needed)
+
+Migration Path:
+  - Team > 10 → Consider microservices
+  - Domains conflict → Extract bounded contexts
+  - Read performance issues → Add CQRS
+```
+
+---
+
+## Example 3: Enterprise (100K+ Users)
+
+```yaml
+Requirements:
+  - 100K+ users
+  - 10+ developers
+  - Multiple business domains
+  - Different scaling needs
+  - 24/7 availability
+
+Architecture Decisions:
+  App Structure: Microservices (independent scale)
+  API Gateway: Kong/AWS API GW
+  Domain Model: Full DDD
+  Consistency: Event-driven (eventual OK)
+  Message Bus: Kafka
+  Authentication: OAuth + SAML (enterprise SSO)
+  Database: Polyglot (right tool per job)
+  CQRS: Selected services
+
+Operational Requirements:
+  - Service mesh (Istio/Linkerd)
+  - Distributed tracing (Jaeger/Tempo)
+  - Centralized logging (ELK/Loki)
+  - Circuit breakers (Resilience4j)
+  - Kubernetes/Helm
+```