feat: add content management feature for superadmin

- Implemented API endpoint for fetching content list with filtering, sorting, and pagination.
- Added DTOs for content items and tenant information.
- Created frontend components for content management, including search and data table functionalities.
- Updated routing to include content management page.
- Enhanced the superadmin menu to navigate to the new content management section.
- Included necessary styles and scripts for the new content management interface.

frontend/superadmin/src/service/ContentService.js

@@ -7,6 +7,66 @@ function normalizeItems(items) {
 }
 
 export const ContentService = {
+    async listContents({
+        page,
+        limit,
+        id,
+        tenant_id,
+        tenant_code,
+        tenant_name,
+        user_id,
+        username,
+        keyword,
+        status,
+        visibility,
+        published_at_from,
+        published_at_to,
+        created_at_from,
+        created_at_to,
+        price_amount_min,
+        price_amount_max,
+        sortField,
+        sortOrder
+    } = {}) {
+        const iso = (d) => {
+            if (!d) return undefined;
+            const date = d instanceof Date ? d : new Date(d);
+            if (Number.isNaN(date.getTime())) return undefined;
+            return date.toISOString();
+        };
+
+        const query = {
+            page,
+            limit,
+            id,
+            tenant_id,
+            tenant_code,
+            tenant_name,
+            user_id,
+            username,
+            keyword,
+            status,
+            visibility,
+            published_at_from: iso(published_at_from),
+            published_at_to: iso(published_at_to),
+            created_at_from: iso(created_at_from),
+            created_at_to: iso(created_at_to),
+            price_amount_min,
+            price_amount_max
+        };
+        if (sortField && sortOrder) {
+            if (sortOrder === 1) query.asc = sortField;
+            if (sortOrder === -1) query.desc = sortField;
+        }
+
+        const data = await requestJson('/super/v1/contents', { query });
+        return {
+            page: data?.page ?? page ?? 1,
+            limit: data?.limit ?? limit ?? 10,
+            total: data?.total ?? 0,
+            items: normalizeItems(data?.items)
+        };
+    },
     async listTenantContents(
         tenantID,
         {