Major improvements:
- Atomic file writes using temp file + rename pattern
- Structured logging with logging module (replaces print)
- StateField class for HAProxy state field indices
- Helper function get_backend_and_prefix() to reduce duplication
- Consistent exception chaining with 'from e'
- Proper fd/temp_path tracking to prevent resource leaks
- Added IOError handling in server management functions
Technical changes:
- save_map_file, save_servers_config, haproxy_save_state now use
atomic writes with tempfile.mkstemp() + os.rename()
- Standardized on 'set server state ready' (was 'enable server')
- All magic numbers for state parsing replaced with StateField class
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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