fix(backend): 修复扫码页 index.html not found

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.42] - 2026-06-15
+
+### 修复
+- 修复商品二维码扫码页报"index.html not found"的错误
+
 ## [1.0.41] - 2026-06-15
 
 ### 改进

backend/config/config.go

@@ -80,7 +80,7 @@ func Load() {
 	viper.SetDefault("storage.upload_dir", "./uploads/images")
 	viper.SetDefault("storage.base_url", "http://localhost:8080/images")
 	viper.SetDefault("storage.public_url", "http://localhost:8081")
-	viper.SetDefault("storage.web_dir", "./client/build/web")
+	viper.SetDefault("storage.web_dir", "./web")
 
 	if err := viper.ReadInConfig(); err != nil {
 		log.Println("[config] no config file found, using defaults and env vars")