Refactor and clean up game assets and editor modules

- Deleted unused weapon and enemy stat assets to streamline project.
- Updated player form assets to reference new default weapon IDs.
- Enhanced DataHub editor UI for better usability, including improved tab management and detail views.
- Removed icon references in various editor modules to simplify the interface.
- Added new boss skill assets and corresponding metadata for future development.
- Created new folders and metadata for organizing boss-related assets, skills, and stats.
- Implemented a new skill asset with updated properties for better gameplay mechanics.

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