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/pages/delete-modal.config.ts

@@ -40,7 +40,7 @@ export const deleteModalConfigs: Record<string, DeleteModalConfig> = {
     itemNameSingular: 'task',
     itemNamePlural: 'tasks',
   },
-  '/writer/drafts': {
+  '/writer/content': {
     title: 'Delete Drafts',
     singleItemMessage: 'You are about to delete this draft. This action cannot be undone.',
     multipleItemsMessage: (count: number) => `You are deleting ${count} drafts. This action cannot be undone.`,