feat: add comment replies and liking functionality

- Introduced support for nested comment replies in both frontend and backend.
- Added comment liking and unliking features, including like count and "isLiked" state tracking.
- Updated database schema with `parentId` and new `comment_likes` table.
- Enhanced UI for threaded comments and implemented display of like counts and reply actions.
- Refactored APIs and repositories to support replies, likes, and enriched comment data.

frontend/src/services/comment.service.ts

@@ -3,6 +3,9 @@ import api from "@/lib/api";
 export interface Comment {
 	id: string;
 	text: string;
+	parentId?: string;
+	likesCount: number;
+	isLiked: boolean;
 	createdAt: string;
 	updatedAt: string;
 	user: {
@@ -19,9 +22,14 @@ export const CommentService = {
 		return data;
 	},
 
-	async create(contentId: string, text: string): Promise<Comment> {
+	async create(
+		contentId: string,
+		text: string,
+		parentId?: string,
+	): Promise<Comment> {
 		const { data } = await api.post<Comment>(`/contents/${contentId}/comments`, {
 			text,
+			parentId,
 		});
 		return data;
 	},
@@ -29,4 +37,12 @@ export const CommentService = {
 	async remove(commentId: string): Promise<void> {
 		await api.delete(`/comments/${commentId}`);
 	},
+
+	async like(commentId: string): Promise<void> {
+		await api.post(`/comments/${commentId}/like`);
+	},
+
+	async unlike(commentId: string): Promise<void> {
+		await api.delete(`/comments/${commentId}/like`);
+	},
 };