feat: Set up Task Master AI project management system

- Initialize Task Master AI with configuration and PRD
- Create comprehensive project improvement plan (10 tasks)
- Set up MCP server integration for Claude Code
- Add custom slash commands and tool configurations
- Generate structured task breakdown for development phases:
  * Phase 1: TypeScript strict mode, code quality, security
  * Phase 2: Zustand, TanStack Query, testing setup
  * Phase 3: Performance optimization, automated deployment
  * Phase 4: Monitoring, bundle optimization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/taskmaster-complete.md

@@ -0,0 +1,9 @@
+Task Master 태스크 완료: $ARGUMENTS
+
+단계:
+
+1. `task-master show $ARGUMENTS`로 현재 태스크 검토
+2. 모든 구현이 완료되었는지 확인
+3. 해당 태스크와 관련된 테스트 실행
+4. `task-master set-status --id=$ARGUMENTS --status=done`으로 완료 표시
+5. `task-master next`로 다음 가능한 태스크 표시