Only allow one FTP operation at a time

[1Blademaster]

No description provided.

[Copilot]

Pull request overview

This PR implements a locking mechanism to prevent concurrent FTP operations by introducing a current_op field that tracks the currently executing operation. The implementation uses try-finally blocks to ensure the lock is always released, even when errors occur.

Key Changes:

• Added current_op instance variable to track active FTP operations
• Wrapped listFiles and readFile methods with try-finally blocks for automatic cleanup
• Added comprehensive test coverage for blocking behavior and cleanup scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
radio/app/controllers/ftpController.py	Implements operation locking mechanism with current_op tracking and try-finally cleanup in listFiles and readFile methods
radio/tests/test_ftpController.py	Adds test coverage for concurrent operation blocking, error cleanup, and sequential operation execution

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[NexInfinite]

LGTM