feat: Introduce announcements service, integrate MinIO for lesson media with presigned URLs, and restrict editing of pending courses.

Backend/src/types/ChaptersLesson.typs.ts

@@ -19,9 +19,10 @@ export interface LessonAttachmentData {
     file_path: string;
     file_size: number;
     mime_type: string;
-    description: MultiLanguageText | null;
+    description?: MultiLanguageText | null;
     sort_order: number;
     created_at: Date;
+    presigned_url?: string | null;
 }
 
 export interface QuizData {
@@ -68,6 +69,7 @@ export interface LessonData {
     is_published: boolean;
     created_at: Date;
     updated_at: Date | null;
+    video_url?: string | null;
     attachments?: LessonAttachmentData[];
     quiz?: QuizData | null;
     progress?: LessonProgressData[];

Backend/src/types/announcements.types.ts

@@ -0,0 +1,56 @@
+import { MultiLanguageText } from './index';
+
+// Use MultiLanguageText from index.ts for consistency
+export type MultiLangText = MultiLanguageText;
+
+export interface Announcement {
+    id: number;
+    title: MultiLangText;
+    content: MultiLangText;
+    status: string;
+    is_pinned: boolean;
+    created_at: Date;
+    updated_at: Date;
+    attachments: AnnouncementAttachment[];
+}
+
+export interface AnnouncementAttachment {
+    id: number;
+    announcement_id: number;
+    file_name: string;
+    file_path: string;
+    created_at: Date;
+    updated_at: Date;
+}
+
+export interface ListAnnouncementResponse{
+    code: number;
+    message: string;
+    data: Announcement[];
+    total: number;
+    page: number;
+    limit: number;
+}
+
+export interface ListAnnouncementInput{
+    token: string;
+    course_id: number;
+    page?: number;
+    limit?: number;
+}
+
+export interface CreateAnnouncementInput{
+    token: string;
+    course_id: number;
+    title: MultiLangText;
+    content: MultiLangText;
+    status: string;
+    is_pinned: boolean;
+    attachments?: AnnouncementAttachment[];
+}
+
+export interface CreateAnnouncementResponse{
+    code: number;
+    message: string;
+    data: Announcement;
+}