feat: Implement instructor search and improve instructor management with email/username lookup and avatar presigned URLs.

Backend/src/types/CoursesInstructor.types.ts

@@ -90,22 +90,52 @@ export interface listCourseinstructorResponse {
 
 export interface addinstructorCourse {
     token: string;
-    user_id: number;
+    email_or_username: string;
     course_id: number;
 }
 
+export interface SearchInstructorInput {
+    token: string;
+    query: string;
+    course_id: number;
+}
+
+export interface SearchInstructorResult {
+    id: number;
+    username: string;
+    email: string;
+    first_name: string | null;
+    last_name: string | null;
+    avatar_url: string | null;
+}
+
+export interface SearchInstructorResponse {
+    code: number;
+    message: string;
+    data: SearchInstructorResult[];
+}
+
 export interface addinstructorCourseResponse {
     code: number;
     message: string;
 }
 
+export interface InstructorInfo {
+    id: number;
+    username: string;
+    email: string;
+    first_name: string | null;
+    last_name: string | null;
+    avatar_url: string | null;
+}
+
 export interface listinstructorCourseResponse {
     code: number;
     message: string;
     data: {
         user_id: number;
         is_primary: boolean;
-        user: User;
+        user: InstructorInfo;
     }[];
 }