Add new fields to TasksSerializer and enhance auto_generate_content_task with detailed step tracking

- Updated TasksSerializer to include 'primary_keyword', 'secondary_keywords', 'tags', and 'categories'.
- Enhanced auto_generate_content_task to track progress with detailed steps, including initialization, preparation, AI call, parsing, and saving.
- Updated progress modal to reflect new phases and improved animation for smoother user experience.
- Adjusted routing and configuration for content and drafts pages in the frontend.

frontend/src/config/routes.config.ts

@@ -36,7 +36,7 @@ export const routes: RouteConfig[] = [
     children: [
       { path: '/writer', label: 'Dashboard', breadcrumb: 'Writer Dashboard' },
       { path: '/writer/tasks', label: 'Tasks', breadcrumb: 'Tasks' },
-      { path: '/writer/drafts', label: 'Drafts', breadcrumb: 'Drafts' },
+      { path: '/writer/content', label: 'Content', breadcrumb: 'Content' },
       { path: '/writer/published', label: 'Published', breadcrumb: 'Published' },
     ],
   },