Description

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Changes

This PR optimizes logging performance and modernizes string formatting throughout the codebase.

Logging Performance Optimization

• Replaced f-string formatting in logging calls with % formatting for lazy evaluation
• This prevents unnecessary string formatting when log levels are disabled (e.g., DEBUG in production)
• Updated 12 logging instances across 6 files

String Formatting Modernization

• Converted .format() calls to f-strings in server/models.py for better readability
• Updated 4 __repr__ methods

Additional Improvements

• Added test_venv/ to .gitignore to prevent virtual environments from being committed

Performance Impact

Using % formatting in logging provides significant performance benefits:

# Before (always evaluates)
logger.debug(f'Task {task_id} saved')

# After (only evaluates if DEBUG is enabled)  
logger.debug('Task %s saved', task_id)

In production with DEBUG disabled, this avoids unnecessary string operations and object conversions.

Fixes NA