feat: add cover image functionality for articles

- Implemented `resolveApiURL` function to handle various URL formats.
- Updated `ArticleDetail` and `UpdateArticleRequest` interfaces to include `cover_asset_url`.
- Enhanced `ArticleEditorView` to manage cover image uploads, including a new `CoverPickerModal` component.
- Added cover image requirements logic in `cover-requirements.ts` to enforce platform-specific cover image rules.
- Modified backend services to handle cover image uploads and validations, including checks for required cover images for specific platforms.
- Improved error handling for cover image requirements during article publishing.

apps/admin-web/src/lib/api.ts

@@ -96,6 +96,24 @@ export function getApiBaseURL(): string {
   return "";
 }
 
+export function resolveApiURL(value?: string | null): string {
+  const trimmed = String(value ?? "").trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (/^https?:\/\//i.test(trimmed)) {
+    return trimmed;
+  }
+  if (/^\/\//.test(trimmed)) {
+    return `https:${trimmed}`;
+  }
+  const apiBaseURL = getApiBaseURL();
+  if (!apiBaseURL) {
+    return trimmed;
+  }
+  return new URL(trimmed, apiBaseURL.endsWith("/") ? apiBaseURL : `${apiBaseURL}/`).toString();
+}
+
 export const apiClient = createApiClient({
   baseURL,
   auth: {
@@ -229,7 +247,10 @@ export const articlesApi = {
       formData,
     );
 
-    return response.data.data;
+    return {
+      ...response.data.data,
+      url: resolveApiURL(response.data.data.url),
+    };
   },
   versions(id: number) {
     return apiClient.get<ArticleVersion[]>(`/api/tenant/articles/${id}/versions`);