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/troubleshoot.md

@@ -0,0 +1,33 @@
+---
+allowed-tools: [Read, Grep, Glob, Bash, TodoWrite]
+description: "Diagnose and resolve issues in code, builds, or system behavior"
+---
+
+# /sc:troubleshoot - Issue Diagnosis and Resolution
+
+## Purpose
+Systematically diagnose and resolve issues in code, builds, deployments, or system behavior.
+
+## Usage
+```
+/sc:troubleshoot [issue] [--type bug|build|performance|deployment] [--trace]
+```
+
+## Arguments
+- `issue` - Description of the problem or error message
+- `--type` - Issue category (bug, build, performance, deployment)
+- `--trace` - Enable detailed tracing and logging
+- `--fix` - Automatically apply fixes when safe
+
+## Execution
+1. Analyze issue description and gather initial context
+2. Identify potential root causes and investigation paths
+3. Execute systematic debugging and diagnosis
+4. Propose and validate solution approaches
+5. Apply fixes and verify resolution
+
+## Claude Code Integration
+- Uses Read for error log analysis
+- Leverages Bash for runtime diagnostics
+- Applies Grep for pattern-based issue detection
+- Maintains structured troubleshooting documentation