feat(api): add TagService and enhance API error handling

Introduce `TagService` to manage tag-related API interactions. Add SSR cookie interceptor for API requests and implement token refresh logic on 401 errors. Update `FavoriteService` to use `favoritesOnly` filter for exploring content.

frontend/src/services/favorite.service.ts

@@ -14,9 +14,15 @@ export const FavoriteService = {
 		limit: number;
 		offset: number;
 	}): Promise<PaginatedResponse<Content>> {
-		const { data } = await api.get<PaginatedResponse<Content>>("/favorites", {
-			params,
-		});
+		const { data } = await api.get<PaginatedResponse<Content>>(
+			"/contents/explore",
+			{
+				params: {
+					...params,
+					favoritesOnly: true,
+				},
+			},
+		);
 		return data;
 	},
 };

frontend/src/services/tag.service.ts

@@ -0,0 +1,16 @@
+import api from "@/lib/api";
+import type { Tag } from "@/types/content";
+
+export const TagService = {
+	async getAll(
+		params: {
+			limit?: number;
+			offset?: number;
+			query?: string;
+			sort?: "popular" | "recent";
+		} = {},
+	): Promise<Tag[]> {
+		const { data } = await api.get<Tag[]>("/tags", { params });
+		return data;
+	},
+};