Introduce optional `HudDuration` and `DescriptionHudDuration` fields in skill config metadata and propagate them through all skill config constructors and `skillsInfo.json`.
Refactored command handling to improve player and skill lookup logic, replaced some list operations with direct queries, and updated method signatures for clarity and null safety. The vote system was reworked to support more robust vote tracking, cooldowns, and localized chat messages. Language files were updated to add new vote-related translations. Various code style and nullability improvements were made throughout the plugin.
