feat: init AI email summarization bot

- Multi-account IMAP email polling with UID tracking
- DeepSeek API integration with JSON Mode structured output
- Telegram notification with formatted MarkdownV2 message
- YAML config with dataclass-based type validation
- Graceful shutdown on SIGINT/SIGTERM
- 60s default polling interval

activate.bat

@@ -0,0 +1,2 @@
+@echo off
+start "Python Venv" /D "%~dp0" cmd /k "%~dp0.venv\Scripts\activate.bat"