fix(backend): disable control thread for local development environment

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📝 Pull Request Template

1. Related Issue

Closes # (issue number)

2. Type of Change (select one)

Bug Fix

3. Description

PyCharm's debugger replaces sys.stdin with a custom wrapper (pydevd / pydev_stdin) to capture console input. That wrapper calls debugger internals that rely on thread-local state. When a background thread (such as stdin-control thread) iterates sys.stdin, the debugger helper checks a thread-local attribute (e.g. is_lock_acquired) that only exists for the debugger's main thread. In other threads the attribute is missing, causing AttributeError: '_thread._local' object has no attribute 'is_lock_acquired'.

4. Testing

• I have tested this locally.
• I have updated or added relevant tests.

5. Checklist

• I have read the Code of Conduct
• I have followed the Contributing Guidelines
• My changes follow the project's coding style