Refactor: Optimize IMAP deletions, fix server timeouts, and modernize codebase

[kingfly55]

Title: Refactor: Optimize IMAP deletions, fix server timeouts, and modernize codebase

Description:
This PR refactors the legacy AutoUnsubscriber script to address critical performance bottlenecks, server compatibility issues (specifically with Zoho/custom domains), and reliability concerns.

Key Changes:

• Performance Optimization (Batching):

• Implemented batch fetching (50 emails/chunk) in getEmails() to prevent socket error: EOF on large inboxes.

• Implemented batch deletion in deleteEmails().

• Moved EXPUNGE command outside the deletion loop to execute only once per session, significantly reducing server operations.

• Server Compatibility:

• Fixed search() command syntax (split arguments into a list) to comply with strict IMAP implementations (e.g., Zoho).

• Added Manual IMAP Server Entry for custom domains that are not auto-detected.

• Reliability & Safety:

• Added tqdm progress bars for real-time feedback during scanning and deletion.

• Added a strict "Type DELETE to confirm" safety check before removing any data.

• Implemented proper logging instead of relying solely on print statements.

• Added try/except blocks inside batch loops to prevent a single corrupt email from crashing the entire process.

Testing:

• Tested on Zoho Mail with a custom domain.
• Verified that "Socket/EOF" errors on large inboxes (9k+ emails) are resolved via batching.
• Confirmed emails are correctly flagged as \Deleted and expunged.

Dependencies:

• Added tqdm
• Updated pyzmail to pyzmail36 (via uv instructions) for Python 3 compatibility.