Introduces an 'imageDownloadProxy' config option to OneBot, allowing image downloads via a specified HTTP proxy. Updates the file download logic in napcat-common to use the undici library for proxy support, and propagates the new config through backend, frontend, and type definitions. Also adds undici as a dependency.
Introduced new interface definitions in napcat-common for logging, status, and subscription. Refactored napcat-webui-backend to use these interfaces, decoupling it from napcat-core and napcat-onebot. Moved OneBot config schema to backend and updated imports. Updated framework and shell to pass subscriptions to InitWebUi. Improved type safety and modularity across backend and shared packages.
