Introduces a persistent plugins.json config to track enabled/disabled status for plugins, updates the plugin manager to respect this config when loading plugins, and adds API and frontend support for toggling plugin status. The backend now reports plugin status as 'active', 'stopped', or 'disabled', and the frontend displays these states with appropriate labels. Also updates the built-in plugin package.json with author info.
Introduces the napcat-plugin-builtin package with initialization, message handling, and build configuration. Also adds a type-safe 'call' helper to the action map in napcat-onebot for improved action invocation.
