feat: serena MCP 설정 추가

.serena/memories/task_completion_checklist.md

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+# Task Completion Checklist
+
+After completing a coding task, ensure:
+
+1. **Migrations**: If models were changed, run `python manage.py makemigrations` and `python manage.py migrate`
+2. **Tests**: Run `python manage.py test` to verify nothing is broken
+3. **No linter/formatter configured**: The project does not currently have a linter or formatter set up (no ruff, black, flake8, etc. in pyproject.toml)
+4. **Static files**: If templates/static files changed, run `python manage.py collectstatic`
+5. **Strategy registration**: If a new strategy was added, ensure it's registered in `strategies/implementations.py` and `strategies/impls/__init__.py`