Initial commit: IMAP email downloader

Single-file Python script to download emails from IMAP servers:
- Downloads emails as .eml files preserving folder structure
- Extracts attachments to zip files
- Supports SSL and STARTTLS connections
- Incremental updates using UID tracking (default behavior)
- Multi-account support with separate folders per email
- Safety checks to prevent duplicate downloads

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,8 @@
+# Python
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+
+# Downloads
+download/