Major architectural refactor:
- Convert invcount and conssheets to self-contained modules
- Add Module Manager with upload/install/uninstall
- Implement auto-restart after module installation
- Add drag-and-drop module upload system
- Create triple-confirmation uninstall flow
- Redesign Module Manager UI with card layout
- Support dynamic module loading from /modules/
This enables easy distribution and installation of new modules
without code changes to core application.
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