feat(users): add avatar and bio support, improve user profile handling

Introduce `avatarUrl` and `bio` fields in the user schema. Update repository, service, and controller to handle avatar uploads, processing, and bio updates. Add S3 integration for avatar storage and enhance user data handling for private and public profiles.

frontend/src/types/user.ts

@@ -4,12 +4,12 @@ export interface User {
 	email: string;
 	displayName?: string;
 	avatarUrl?: string;
+	bio?: string;
 	role: "user" | "admin";
 	createdAt: string;
 }
 
 export interface UserProfile extends User {
-	bio?: string;
 	favoritesCount: number;
 	uploadsCount: number;
 }