feat: Add useCourse composable for course data management and CourseDetailView component for displaying course details.

Frontend-Learner/composables/useCourse.ts

@@ -37,6 +37,32 @@ export interface Course {
       video_url?: string
     }[]
   }[]
+
+  // ข้อมูลผู้สอนและเจ้าของคอร์ส
+  creator?: {
+    id: number
+    username: string
+    email: string
+    profile: {
+      first_name: string
+      last_name: string
+      avatar_url: string
+    }
+  }
+  instructors?: {
+    user_id: number
+    is_primary: boolean
+    user: {
+      id: number
+      username: string
+      email: string
+      profile: {
+        first_name: string
+        last_name: string
+        avatar_url: string
+      }
+    }
+  }[]
 }
 
 interface CourseResponse {