feat(migrations): Harden task audit tracking and optimize article templates

- Added migration to harden task audit tracking by modifying audit_logs and related tables.
- Introduced operator_id to several tables for better tracking of actions.
- Updated article_templates with new prompt templates for various article types, enhancing content generation.
- Created prompt_rules and schedule_tasks tables to manage content generation rules and scheduling.
- Added foreign key constraints to articles for better data integrity.

server/internal/tenant/repository/queries/workspace.sql

@@ -12,7 +12,7 @@ WHERE tenant_id = sqlc.arg(tenant_id) AND deleted_at IS NULL;
 
 -- name: GetRecentArticles :many
 SELECT a.id, a.generate_status, a.publish_status, a.source_type, a.created_at,
-       av.title, av.word_count, av.source_label,
+       av.title, av.markdown_content, av.word_count, av.source_label,
        t.template_name
 FROM articles a
 LEFT JOIN article_versions av ON av.id = a.current_version_id