feat: implement zero-configuration auto-enhancement demo workflow

- Add intelligent auto-enhancement that detects viable content elements
- Replace manual enhancement with automated container-first detection
- Support inline formatting (strong, em, span, links) within editable content
- Streamline demo workflow: just demo shows options, auto-enhances on demand
- Clean up legacy commands and simplify directory structure
- Auto-enhancement goes directly from source to demo-ready (no intermediate dirs)
- Add Dan Eden portfolio and simple test sites for real-world validation
- Auto-enhanced 40 elements in Dan Eden portfolio, 5 in simple site
- Achieve true zero-configuration CMS experience

insertr.yaml

@@ -17,6 +17,11 @@ server:
       domain: "localhost:3000"
       auto_enhance: true
       backup_originals: true
+    - site_id: "dan-eden-test"
+      path: "./test-sites/simple/dan-eden-portfolio"
+      domain: "localhost:3001"
+      auto_enhance: true
+      backup_originals: true
     # Example additional site configuration:
     # - site_id: "mysite"
     #   path: "/var/www/mysite"