docs: 시스템 아키텍처 및 명령어 문서 추가

- COMMAND.md: 다양한 명령어와 설명 추가
- .claude/commands/design/1-system-architecture: 시스템 아키텍처 관련 문서 삭제
- .claude/commands/sc: 코드 분석, 빌드, 클린업, 설계, 문서화, 추정, 설명, Git 작업, 구현, 개선, 테스트, 문제 해결, 워크플로우 생성 등 다양한 명령어 문서 추가

.claude/commands/sc/build.md

@@ -0,0 +1,34 @@
+---
+allowed-tools: [Read, Bash, Glob, TodoWrite, Edit]
+description: "Build, compile, and package projects with error handling and optimization"
+---
+
+# /sc:build - Project Building
+
+## Purpose
+Build, compile, and package projects with comprehensive error handling and optimization.
+
+## Usage
+```
+/sc:build [target] [--type dev|prod|test] [--clean] [--optimize]
+```
+
+## Arguments
+- `target` - Project or specific component to build
+- `--type` - Build type (dev, prod, test)
+- `--clean` - Clean build artifacts before building
+- `--optimize` - Enable build optimizations
+- `--verbose` - Enable detailed build output
+
+## Execution
+1. Analyze project structure and build configuration
+2. Validate dependencies and environment setup
+3. Execute build process with error monitoring
+4. Handle build errors and provide diagnostic information
+5. Optimize build output and report results
+
+## Claude Code Integration
+- Uses Bash for build command execution
+- Leverages Read for build configuration analysis
+- Applies TodoWrite for build progress tracking
+- Maintains comprehensive error handling and reporting