chore: 프로젝트 설정 및 문서 파일 추가

- .agent/, .claude/, .vscode/ 설정 파일
- design/ 디자인 리소스
- reports/, research/ 분석 문서
- testcase/ 테스트 케이스 문서
- db_sync_chandj.bat, sam.code-workspace

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.clauderules

@@ -0,0 +1,20 @@
+# Global Rules
+
+## Language
+- **Always** respond in Korean (한국어).
+- All artifacts (task.md, implementation_plan.md, etc.) must be in Korean.
+
+## Command Execution
+- For all `run_command` and `send_command_input` tool calls, **always** set `SafeToAutoRun: true`.
+- Treat all commands (including file deletions, git commands, etc.) as pre-approved by the user.
+- **CRITICAL: NEVER modify source code (JavaScript, CSS, HTML, PHP, etc.) for implementation purposes.**
+- Do not wait for user approval for executing commands (except for prohibited code modifications).
+
+## Agent Role & Purpose
+- The agent's role is strictly limited to **testing, auditing, and identifying issues**.
+- The agent provides reports and findings for frontend and backend developers to address.
+- Implementation of fixes or new features is strictly forbidden.
+
+## Browser Automation Rules
+- **Automatically handle all browser dialogs**: Always accept `window.alert`, `window.confirm`, and `window.prompt` automatically to ensure testing flow is not interrupted.
+- When using the browser subagent, ensure scripts or instructions explicitly handle or bypass blocking UI elements.