Fix demo site auto-enhancement and content persistence

- Restructure demo directory from test-sites/ to demos/ with flattened layout
- Add auto-enhancement on server startup for all sites with auto_enhance: true
- Fix inconsistent content ID generation that prevented dan-eden-portfolio content persistence
- Update server configuration to enhance from source to separate output directories
- Remove manual enhancement from justfile in favor of automatic server enhancement
- Clean up legacy test files and unused restore command
- Update build system to use CDN endpoint instead of file copying

demos/simple/insertr.yaml

@@ -0,0 +1,27 @@
+# Insertr Configuration for Simple Demo Site
+# Specific configuration for the simple test site demo
+
+# Global settings
+dev_mode: true           # Development mode for demos
+
+# Database configuration  
+database:
+  path: "./insertr.db"   # Shared database with main config
+
+# Demo-specific configuration
+demo:
+  site_id: "simple"      # Unique site ID for simple demo
+  inject_demo_gate: true # Auto-inject demo gate if no gates exist
+  mock_auth: true        # Use mock authentication for demos
+  api_endpoint: "http://localhost:8080/api/content"
+  demo_port: 3000        # Port for live-server
+
+# CLI enhancement configuration
+cli:
+  site_id: "simple"      # Site ID for this demo
+  output: "./demos/simple_enhanced" # Output directory for enhanced files
+  inject_demo_gate: true # Inject demo gate in development mode
+
+# Authentication configuration (for demo)
+auth:
+  provider: "mock"       # Mock auth for demos