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.

app/app.config.ts

@@ -0,0 +1,11 @@
+export default defineAppConfig({
+  ui: {
+    colors: {
+      primary: 'blue',
+      neutral: 'neutral'
+    },
+    container: {
+      base: 'max-w-4xl'
+    }
+  }
+})