- Introduced optional keepalive settings: `keepalive_idle` and `keepalive_count` in the Server struct.
- Implemented UI controls for keepalive settings in System Settings, including validation and persistence.
- Added localization support for new keepalive fields in multiple languages.
- Created a manual test tracking plan for verifying keepalive controls and their behavior.
- Updated existing tests to cover new functionality and ensure proper validation of keepalive inputs.
- Ensured safe defaults and fallback behavior for missing or invalid keepalive values.
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