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

internal/engine/id_generator.go

@@ -33,12 +33,8 @@ func (g *IDGenerator) Generate(node *html.Node, filePath string) string {
 	tag := strings.ToLower(node.Data)
 	primaryClass := g.getPrimaryClass(node)
 
-	// 3. Position context (simple)
-	elementKey := g.getElementKey(fileName, tag, primaryClass)
-	index := g.getElementIndex(elementKey)
-
-	// 4. Build readable prefix
-	prefix := g.buildPrefix(fileName, tag, primaryClass, index)
+	// 3. Build readable prefix (deterministic, no runtime counting)
+	prefix := g.buildDeterministicPrefix(fileName, tag, primaryClass)
 
 	// 5. Add collision-resistant suffix
 	signature := g.createSignature(node, filePath)
@@ -84,7 +80,22 @@ func (g *IDGenerator) getElementIndex(elementKey string) int {
 	return g.elementCounts[elementKey]
 }
 
-// buildPrefix creates human-readable prefix for the ID
+// buildDeterministicPrefix creates human-readable prefix without runtime counting
+func (g *IDGenerator) buildDeterministicPrefix(fileName, tag, primaryClass string) string {
+	var parts []string
+	parts = append(parts, fileName)
+
+	if primaryClass != "" {
+		parts = append(parts, primaryClass)
+	} else {
+		parts = append(parts, tag)
+	}
+
+	// No runtime index - rely on hash for uniqueness
+	return strings.Join(parts, "-")
+}
+
+// buildPrefix creates human-readable prefix for the ID (legacy method)
 func (g *IDGenerator) buildPrefix(fileName, tag, primaryClass string, index int) string {
 	var parts []string
 	parts = append(parts, fileName)