feat(contents): enhance user-specific data handling and admin content management

Integrate user-specific fields (`isLiked`, `favoritesCount`) in content APIs and improve `ContentCard` through reactive updates. Add admin-only content deletion support. Refactor services and repository to enrich responses with additional data (author details, tags).

backend/src/contents/contents.service.ts

@@ -126,7 +126,18 @@ export class ContentsService {
 			this.contentsRepository.count(options),
 		]);
 
-		return { data, totalCount };
+		const processedData = data.map((content) => ({
+			...content,
+			url: this.getFileUrl(content.storageKey),
+			author: {
+				...content.author,
+				avatarUrl: content.author?.avatarUrl
+					? this.getFileUrl(content.author.avatarUrl)
+					: null,
+			},
+		}));
+
+		return { data: processedData, totalCount };
 	}
 
 	async create(userId: string, data: CreateContentDto) {
@@ -162,8 +173,30 @@ export class ContentsService {
 		return deleted;
 	}
 
-	async findOne(idOrSlug: string) {
-		return this.contentsRepository.findOne(idOrSlug);
+	async removeAdmin(id: string) {
+		this.logger.log(`Removing content ${id} by admin`);
+		const deleted = await this.contentsRepository.softDeleteAdmin(id);
+
+		if (deleted) {
+			await this.clearContentsCache();
+		}
+		return deleted;
+	}
+
+	async findOne(idOrSlug: string, userId?: string) {
+		const content = await this.contentsRepository.findOne(idOrSlug, userId);
+		if (!content) return null;
+
+		return {
+			...content,
+			url: this.getFileUrl(content.storageKey),
+			author: {
+				...content.author,
+				avatarUrl: content.author?.avatarUrl
+					? this.getFileUrl(content.author.avatarUrl)
+					: null,
+			},
+		};
 	}
 
 	generateBotHtml(content: { title: string; storageKey: string }): string {