feat: Implement WordPress publishing and unpublishing actions

- Added conditional visibility for table actions based on content state (published/draft).
- Introduced `publishContent` and `unpublishContent` API functions for handling WordPress integration.
- Updated `Content` component to manage publish/unpublish actions with appropriate error handling and success notifications.
- Refactored `PostEditor` to remove deprecated SEO fields and consolidate taxonomy management.
- Enhanced `TablePageTemplate` to filter row actions based on visibility conditions.
- Updated backend API to support publishing and unpublishing content with proper status updates and external references.

frontend/src/services/api.ts

@@ -2074,6 +2074,38 @@ export async function fetchContentById(id: number): Promise<Content> {
   return fetchAPI(`/v1/writer/content/${id}/`);
 }
 
+// Content Publishing API
+export interface PublishContentResult {
+  content_id: number;
+  status: string;
+  external_id: string;
+  external_url: string;
+  message?: string;
+}
+
+export interface UnpublishContentResult {
+  content_id: number;
+  status: string;
+  message?: string;
+}
+
+export async function publishContent(id: number, site_id?: number): Promise<PublishContentResult> {
+  const body: { site_id?: number } = {};
+  if (site_id !== undefined) {
+    body.site_id = site_id;
+  }
+  return fetchAPI(`/v1/writer/content/${id}/publish/`, {
+    method: 'POST',
+    body: JSON.stringify(body),
+  });
+}
+
+export async function unpublishContent(id: number): Promise<UnpublishContentResult> {
+  return fetchAPI(`/v1/writer/content/${id}/unpublish/`, {
+    method: 'POST',
+  });
+}
+
 // Stage 3: Content Validation API
 export interface ContentValidationResult {
   content_id: number;