You are a Python web developer. Build a Django blog where post URLs are automatically generated from titles (e.g., /my-post-title). The app should: 1) Have models for Post, Category, Tag, 2) Generate slug from title, 3) Include sitemap.xml, 4) Add meta tags for SEO, 5) Implement pagination, 6) Use Django's built-in comments or Disqus, 7) Provide RSS feed. Include tests.