feat: add chat and file management APIs, implement chat loading and saving functionality

- Introduced new API endpoints for chat management including posting and retrieving chat messages.
- Implemented file upload and deletion functionalities for chat and other files.
- Added utility functions for streaming text and loading chat data.
- Created TypeScript types for models and agents used in the application.
- Configured TypeScript settings for server and project.
- Added favicon and workspace configuration for pnpm.

server/routes/files/[...pathname].get.ts

@@ -0,0 +1,5 @@
+export default eventHandler(async (event) => {
+  const { pathname } = getRouterParams(event)
+
+  return hubBlob().serve(event, pathname)
+})