fix: restore full green test suite, fix backup runtime bug, and prepare v1.0.0 release

[Opselon]

Summary

• Fix critical runtime NameError: name 'parse_mode' is not defined in src/main.py:backup()
• Fix updater critical file validation to tolerate absent optional key files gracefully
• Update stale test assertions across test_system_commands.py, test_service_management.py, and test_bot_e2e.py to match modern _edit_message_safely / _send_message_safely call flows
• Align test_updater.py with the real _stop_bot_gracefully / _start_bot_gracefully abstractions
• Modernize test_security.py to validate versioned JSON Fernet key generation and encrypt/decrypt roundtrips
• Full 56/56 pytest test suite and smoke tests now pass 100% green

[chatgpt-codex-connector]

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