feat: update instructor search to exclude self and existing course instructors, add email_verified_at to user responses

Update searchInstructors endpoint to accept courseId parameter and filter out the requesting instructor and instructors already assigned to the course. Add email_verified_at field to UserResponse type and include it in auth and user service responses.

Backend/src/controllers/CoursesInstructorController.ts

@@ -48,18 +48,23 @@ export class CoursesInstructorController {
     }
 
     /**
-     * ค้นหาผู้สอนทั้งหมดในระบบ
-     * Search all instructors in database
+     * ค้นหาผู้สอนทั้งหมดในระบบ (ไม่รวมตัวเองและคนที่อยู่ในคอร์สแล้ว)
+     * Search all instructors in database (excluding self and existing course instructors)
+     * @param courseId - รหัสคอร์ส / Course ID
      * @param query - คำค้นหา (email หรือ username) / Search query (email or username)
      */
-    @Get('search-instructors')
+    @Get('{courseId}/search-instructors')
     @Security('jwt', ['instructor'])
     @SuccessResponse('200', 'Instructors found')
     @Response('401', 'Invalid or expired token')
-    public async searchInstructors(@Request() request: any, @Query() query: string): Promise<SearchInstructorResponse> {
+    public async searchInstructors(
+        @Request() request: any,
+        @Path() courseId: number,
+        @Query() query: string
+    ): Promise<SearchInstructorResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
         if (!token) throw new ValidationError('No token provided');
-        return await CoursesInstructorService.searchInstructors({ token, query });
+        return await CoursesInstructorService.searchInstructors({ token, query, course_id: courseId });
     }
 
     /**

Backend/src/services/CoursesInstructor.service.ts

@@ -356,16 +356,26 @@ export class CoursesInstructorService {
 
     static async searchInstructors(input: SearchInstructorInput): Promise<SearchInstructorResponse> {
         try {
-            jwt.verify(input.token, config.jwt.secret) as { id: number };
+            const decoded = jwt.verify(input.token, config.jwt.secret) as { id: number };
 
-            // Search all instructors by email or username
+            // Get existing instructors in the course
+            const existingInstructors = await prisma.courseInstructor.findMany({
+                where: { course_id: input.course_id },
+                select: { user_id: true },
+            });
+            const existingInstructorIds = existingInstructors.map(i => i.user_id);
+
+            // Search all instructors by email or username, excluding self and existing course instructors
             const users = await prisma.user.findMany({
                 where: {
                     OR: [
                         { email: { contains: input.query, mode: 'insensitive' } },
                         { username: { contains: input.query, mode: 'insensitive' } },
                     ],
-                    role: { code: 'INSTRUCTOR' }
+                    role: { code: 'INSTRUCTOR' },
+                    id: {
+                        notIn: [decoded.id, ...existingInstructorIds],
+                    },
                 },
                 include: {
                     profile: true

Backend/src/services/auth.service.ts

@@ -398,6 +398,7 @@ export class AuthService {
             id: user.id,
             username: user.username,
             email: user.email,
+            email_verified_at: user.email_verified_at,
             updated_at: user.updated_at,
             created_at: user.created_at,
             role: {
@@ -423,6 +424,7 @@ export class AuthService {
             id: user.id,
             username: user.username,
             email: user.email,
+            email_verified_at: user.email_verified_at,
             updated_at: user.updated_at,
             created_at: user.created_at,
             role: {

Backend/src/services/user.service.ts

@@ -48,6 +48,7 @@ export class UserService {
                 id: user.id,
                 username: user.username,
                 email: user.email,
+                email_verified_at: user.email_verified_at,
                 updated_at: user.updated_at,
                 created_at: user.created_at,
                 role: {
@@ -285,6 +286,7 @@ export class UserService {
             id: user.id,
             username: user.username,
             email: user.email,
+            email_verified_at: user.email_verified_at,
             updated_at: user.updated_at,
             created_at: user.created_at,
             role: {

Backend/src/types/CoursesInstructor.types.ts

@@ -97,6 +97,7 @@ export interface addinstructorCourse {
 export interface SearchInstructorInput {
     token: string;
     query: string;
+    course_id: number;
 }
 
 export interface SearchInstructorResult {

Backend/src/types/user.types.ts

@@ -5,6 +5,7 @@ export interface UserResponse {
     id: number;
     username: string;
     email: string;
+    email_verified_at: Date | null;
     updated_at: Date | null;
     created_at: Date | null;
     role: {