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/analyze.md

@@ -0,0 +1,33 @@
+---
+allowed-tools: [Read, Grep, Glob, Bash, TodoWrite]
+description: "Analyze code quality, security, performance, and architecture"
+---
+
+# /sc:analyze - Code Analysis
+
+## Purpose
+Execute comprehensive code analysis across quality, security, performance, and architecture domains.
+
+## Usage
+```
+/sc:analyze [target] [--focus quality|security|performance|architecture] [--depth quick|deep]
+```
+
+## Arguments
+- `target` - Files, directories, or project to analyze
+- `--focus` - Analysis focus area (quality, security, performance, architecture)
+- `--depth` - Analysis depth (quick, deep)
+- `--format` - Output format (text, json, report)
+
+## Execution
+1. Discover and categorize files for analysis
+2. Apply appropriate analysis tools and techniques
+3. Generate findings with severity ratings
+4. Create actionable recommendations with priorities
+5. Present comprehensive analysis report
+
+## Claude Code Integration
+- Uses Glob for systematic file discovery
+- Leverages Grep for pattern-based analysis
+- Applies Read for deep code inspection
+- Maintains structured analysis reporting