feat: implement avatar upload functionality with presigned URL support for user profiles and announcement attachments.

Backend/src/types/announcements.types.ts

@@ -16,6 +16,7 @@ export interface AnnouncementAttachment {
     announcement_id: number;
     file_name: string;
     file_path: string;
+    presigned_url?: string | null;
     created_at: Date;
     updated_at: Date;
 }

Backend/src/types/user.types.ts

@@ -68,4 +68,18 @@ export interface ChangePasswordRequest {
 export interface ChangePasswordResponse {
     code: number;
     message: string;
+};
+
+export interface updateAvatarRequest {
+    token: string;
+    avatar_url: string;
+};
+
+export interface updateAvatarResponse {
+    code: number;
+    message: string;
+    data: {
+        id: number;
+        avatar_url: string;
+    };
 };