Refactor site configuration and color scheme management

- Replaced static config with dynamic site info context.
- Updated color scheme handling in various components to use site info.
- Removed deprecated config file and integrated site info fetching.
- Enhanced user preference page to allow color scheme selection.
- Adjusted blog and console components to reflect new site info structure.
- Improved error handling and fallback mechanisms for site info retrieval.

web/src/models/user.ts

@@ -4,6 +4,7 @@ export interface User {
     nickname?: string;
     avatarUrl?: string;
     backgroundUrl?: string;
+    preferredColor?: string;
     email: string;
     gender?: string;
     role: string;