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/load.md

@@ -0,0 +1,33 @@
+---
+allowed-tools: [Read, Grep, Glob, Bash, Write]
+description: "Load and analyze project context, configurations, and dependencies"
+---
+
+# /sc:load - Project Context Loading
+
+## Purpose
+Load and analyze project context, configurations, dependencies, and environment setup.
+
+## Usage
+```
+/sc:load [target] [--type project|config|deps|env] [--cache]
+```
+
+## Arguments
+- `target` - Project directory or specific configuration to load
+- `--type` - Loading type (project, config, deps, env)
+- `--cache` - Cache loaded context for faster subsequent access
+- `--refresh` - Force refresh of cached context
+
+## Execution
+1. Discover and analyze project structure and configuration files
+2. Load dependencies, environment variables, and settings
+3. Parse and validate configuration consistency
+4. Create comprehensive project context map
+5. Cache context for efficient future access
+
+## Claude Code Integration
+- Uses Glob for comprehensive project discovery
+- Leverages Read for configuration analysis
+- Applies Bash for environment validation
+- Maintains efficient context caching mechanisms