📝 Add docstrings to dev

[coderabbitai]

Docstrings generation was requested by @yusuke0610.

• 履歴書生成器のリファクタリングとエラーメッセージの一元化 #270 (comment)

The following files were modified:

• backend/app/main.py
• backend/app/routers/github_link.py
• backend/app/routers/internal.py
• backend/app/services/markdown/generators/resume_generator.py
• backend/app/services/pdf/generators/resume_generator.py
• backend/app/services/shared/resume_format.py
• backend/tests/test_worker/_helpers.py
• backend/tests/test_worker/test_execute_task.py
• backend/tests/test_worker/test_github_link.py

These files were kept as they were

• backend/tests/test_retry_flow.py

These file types are not supported

• .claude/rules/backend/architecture.md
• backend/app/messages.json

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