refactor: Standardize type naming conventions and file casing for course and category types.

Backend/src/controllers/CategoriesController.ts

@@ -1,7 +1,7 @@
 import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Delete, Controller, Security, Request, Put, Path } from 'tsoa';
 import { ValidationError } from '../middleware/errorHandler';
 import { CategoryService } from '../services/categories.service';
-import { createCategory, createCategoryResponse, deleteCategoryResponse, updateCategory, updateCategoryResponse, listCategoriesResponse } from '../types/Categories.type';
+import { createCategory, createCategoryResponse, deleteCategoryResponse, updateCategory, updateCategoryResponse, ListCategoriesResponse } from '../types/categories.type';
 
 @Route('api/categories')
 @Tags('Categories')
@@ -11,7 +11,7 @@ export class CategoriesController {
     @Get()
     @SuccessResponse('200', 'Categories fetched successfully')
     @Response('401', 'Invalid or expired token')
-    public async listCategories(): Promise<listCategoriesResponse> {
+    public async listCategories(): Promise<ListCategoriesResponse> {
         return await this.categoryService.listCategories();
     }
 }

Backend/src/controllers/CoursesController.ts

@@ -1,6 +1,6 @@
 import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Delete, Controller, Security, Request, Put, Path } from 'tsoa';
 import { ValidationError } from '../middleware/errorHandler';
-import { listCourseResponse } from '../types/Courses.types';
+import { listCourseResponse } from '../types/courses.types';
 import { CoursesService } from '../services/courses.service';
 
 @Route('api/courses')

Backend/src/services/categories.service.ts

@@ -3,11 +3,11 @@ import { Prisma } from '@prisma/client';
 import { config } from '../config';
 import { logger } from '../config/logger';
 import jwt from 'jsonwebtoken';
-import { createCategory, createCategoryResponse, deleteCategoryResponse, updateCategory, updateCategoryResponse, listCategoriesResponse, Category } from '../types/Categories.type';
+import { createCategory, createCategoryResponse, deleteCategoryResponse, updateCategory, updateCategoryResponse, ListCategoriesResponse, Category } from '../types/categories.type';
 import { UnauthorizedError, ValidationError, ForbiddenError } from '../middleware/errorHandler';
 
 export class CategoryService {
-    async listCategories(): Promise<listCategoriesResponse> {
+    async listCategories(): Promise<ListCategoriesResponse> {
         try {
             const categories = await prisma.category.findMany();
             return {

Backend/src/services/courses.service.ts

@@ -2,7 +2,7 @@ import { prisma } from '../config/database';
 import { Prisma } from '@prisma/client';
 import { config } from '../config';
 import { logger } from '../config/logger';
-import { listCourseResponse, getCourseResponse } from '../types/Courses.types';
+import { listCourseResponse, getCourseResponse } from '../types/courses.types';
 import { UnauthorizedError, ValidationError, ForbiddenError } from '../middleware/errorHandler';
 
 export class CoursesService {

Backend/src/types/Courses.types.ts

@@ -1,19 +0,0 @@
-import { Course, Prisma } from '@prisma/client';
-
-// Use Prisma's CourseCreateInput for creating courses
-
-// Response type uses Prisma's Course model
-
-
-export interface listCourseResponse {
-    code: number;
-    message: string;
-    data: Course[];
-    total: number | null;
-}
-
-export interface getCourseResponse {
-    code: number;
-    message: string;
-    data: Course | null;
-}

Backend/src/types/categories.type.ts

@@ -12,7 +12,7 @@ export interface Category {
     updated_at: Date | null;
 }
 
-export interface listCategoriesResponse {
+export interface ListCategoriesResponse {
     code: number;
     message: string;
     data: {