feat(staticweb): enhance fallback logic for extensionless paths

* Added support for serving index.html for extensionless paths
* Updated isStaticAsset to exclude paths without extensions from static asset checks

pkg/server/staticweb/mount.go

@@ -75,11 +75,21 @@ func (m *mountPoint) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			fallbackPath := m.fallbackStrategy.GetFallbackPath(filePath)
 			file, err = m.provider.Open(strings.TrimPrefix(fallbackPath, "/"))
 			if err == nil {
-				// Successfully opened fallback file
 				defer file.Close()
 				m.serveFile(w, r, fallbackPath, file)
 				return
 			}
+
+			// For extensionless paths, also try path/index.html
+			if path.Ext(filePath) == "" {
+				indexFallback := path.Join(filePath, "index.html")
+				file, err = m.provider.Open(strings.TrimPrefix(indexFallback, "/"))
+				if err == nil {
+					defer file.Close()
+					m.serveFile(w, r, indexFallback, file)
+					return
+				}
+			}
 		}
 
 		// No fallback or fallback failed - return 404

pkg/server/staticweb/policies/fallback.go

@@ -49,9 +49,15 @@ func (f *HTMLFallbackStrategy) GetFallbackPath(filePath string) string {
 	return f.indexFile
 }
 
-// isStaticAsset checks if the path looks like a static asset (has a file extension).
+// isStaticAsset checks if the path looks like a static asset (has a non-HTML file extension).
+// Paths with no extension are not considered static assets so fallback logic can resolve
+// them to path.html or path/index.html.
 func (f *HTMLFallbackStrategy) isStaticAsset(filePath string) bool {
-	return path.Ext(filePath) != ""
+	ext := strings.ToLower(path.Ext(filePath))
+	if ext == "" || ext == ".html" || ext == ".htm" {
+		return false
+	}
+	return true
 }
 
 // ExtensionBasedFallback implements a fallback strategy that skips fallback for known static file extensions.