Clean up codebase: remove unused demos and test files

- Remove dan-eden-portfolio and devigo-web demo sites
- Clean up demo testing infrastructure and scripts
- Remove frontend test files (html-preservation, style-detection tests)
- Update configuration and auth improvements
- Simplify demo structure to focus on core functionality

This cleanup reduces repository size and focuses on essential demos.

internal/auth/auth.go

@@ -25,20 +25,15 @@ type UserInfo struct {
 	Provider string `json:"iss,omitempty"`
 }
 
-// Type aliases for backward compatibility
-type AuthConfig = config.AuthConfig
-type OAuthConfig = config.OAuthConfig
-type OIDCConfig = config.OIDCConfig
-
 // AuthService handles authentication operations
 type AuthService struct {
-	config   *AuthConfig
+	config   *config.AuthConfig
 	provider *oidc.Provider
 	oauth2   *oauth2.Config
 }
 
 // NewAuthService creates a new authentication service
-func NewAuthService(config *AuthConfig) (*AuthService, error) {
+func NewAuthService(config *config.AuthConfig) (*AuthService, error) {
 	service := &AuthService{config: config}
 
 	// Initialize OIDC provider if configured
@@ -176,7 +171,7 @@ func (a *AuthService) parseOIDCToken(tokenString string) (*UserInfo, error) {
 // parseHMACToken parses and validates a JWT token using HMAC signing
 func (a *AuthService) parseHMACToken(tokenString string) (*UserInfo, error) {
 	// Parse the token
-	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (any, error) {
 		// Validate signing method
 		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
 			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
@@ -336,7 +331,7 @@ func (a *AuthService) RequireAuth(next http.Handler) http.Handler {
 func (a *AuthService) HandleOAuthLogin(w http.ResponseWriter, r *http.Request) {
 	// Handle mock authentication in dev mode
 	if a.config.DevMode && a.config.Provider == "mock" {
-		response := map[string]interface{}{
+		response := map[string]any{
 			"message":      "Mock OAuth login",
 			"redirect_url": "/auth/callback?code=mock_code&state=mock_state",
 			"dev_mode":     true,

internal/engine/utils.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"golang.org/x/net/html"
+	"slices"
 )
 
 // GetClasses extracts CSS classes from an HTML node
@@ -19,12 +20,7 @@ func GetClasses(node *html.Node) []string {
 
 // ContainsClass checks if a class list contains a specific class
 func ContainsClass(classes []string, target string) bool {
-	for _, class := range classes {
-		if class == target {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(classes, target)
 }
 
 // getAttribute gets an attribute value from an HTML node
@@ -37,29 +33,6 @@ func getAttribute(node *html.Node, key string) string {
 	return ""
 }
 
-// hasOnlyTextContent checks if a node contains only text content (no nested HTML elements)
-// DEPRECATED: Use hasEditableContent for more sophisticated detection
-func hasOnlyTextContent(node *html.Node) bool {
-	if node.Type != html.ElementNode {
-		return false
-	}
-
-	for child := node.FirstChild; child != nil; child = child.NextSibling {
-		switch child.Type {
-		case html.ElementNode:
-			// Found a nested HTML element - not text-only
-			return false
-		case html.TextNode:
-			// Text nodes are fine, continue checking
-			continue
-		default:
-			// Comments, etc. - continue checking
-			continue
-		}
-	}
-	return true
-}
-
 // Inline formatting elements that are safe for editing
 var inlineFormattingTags = map[string]bool{
 	"strong": true,