feat: 优化发货交付页面与凭据生成，支持一键复制结果图片及官方商品图片本地缓存

- 交付界面重构：隐藏内部订单号、流水号与发货渠道，展示聚焦于买家游戏UID、角色名与交付时间
- 发货结果凭据生成：采用 Canvas 生成高清发货存证图，优化存证说明文案与自适应排版
- 一键复制图片：支持直接将结果凭证图片写入系统剪贴板，方便客服在聊天窗口快捷粘贴
- 官方图片本地化缓存：全量下载乐玩商品官方主图并建立本地持久化路由，规避外部源站跨域及破损问题
- 修复乐玩渠道角色UID提取与履约状态幂等回填逻辑

backend/internal/handler/delivery.go

@@ -1,8 +1,15 @@
 package handler
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
+	"time"
 
 	"affiliate_dash/internal/pkg/response"
 	"affiliate_dash/internal/service"
@@ -65,6 +72,88 @@ func (h *DeliveryHandler) Submit(c *gin.Context) {
 	response.OK(c, result)
 }
 
+// ImageProxy 代理图片并支持本地持久化缓存，杜绝跨域污染和远端加载失败。
+func (h *DeliveryHandler) ImageProxy(c *gin.Context) {
+	rawURL := strings.TrimSpace(c.Query("url"))
+	if rawURL == "" || (!strings.HasPrefix(rawURL, "http://") && !strings.HasPrefix(rawURL, "https://")) {
+		response.BadRequest(c, "无效的图片地址")
+		return
+	}
+
+	// 1. 优先检查本地官方商品图片缓存
+	for _, base := range []string{"data/uploads/products", "../data/uploads/products", "uploads/products"} {
+		if strings.Contains(rawURL, "/products/") {
+			parts := strings.Split(rawURL, "/products/")
+			if len(parts) > 1 {
+				sub := strings.Split(parts[1], "/")
+				if len(sub) > 0 && sub[0] != "" {
+					localPath := filepath.Join(base, sub[0]+".webp")
+					if info, err := os.Stat(localPath); err == nil && info.Size() > 0 {
+						c.Header("Cache-Control", "public, max-age=2592000, immutable")
+						c.File(localPath)
+						return
+					}
+				}
+			}
+		}
+		// 按 URL SHA256 哈希查本地缓存
+		hash := sha256.Sum256([]byte(rawURL))
+		hashPath := filepath.Join(base, hex.EncodeToString(hash[:])+".webp")
+		if info, err := os.Stat(hashPath); err == nil && info.Size() > 0 {
+			c.Header("Cache-Control", "public, max-age=2592000, immutable")
+			c.File(hashPath)
+			return
+		}
+	}
+
+	// 2. 本地无缓存时请求远端
+	req, err := http.NewRequestWithContext(c.Request.Context(), http.MethodGet, rawURL, nil)
+	if err != nil {
+		response.BadRequest(c, "构建请求失败")
+		return
+	}
+	client := &http.Client{Timeout: 15 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		response.Fail(c, http.StatusBadGateway, http.StatusBadGateway, "图片下载失败")
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		response.Fail(c, resp.StatusCode, resp.StatusCode, "远端图片响应异常")
+		return
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		response.Fail(c, http.StatusBadGateway, http.StatusBadGateway, "读取图片内容失败")
+		return
+	}
+
+	// 3. 异步/同步回写到本地磁盘缓存
+	cacheDir := "data/uploads/products"
+	_ = os.MkdirAll(cacheDir, 0755)
+	if strings.Contains(rawURL, "/products/") {
+		parts := strings.Split(rawURL, "/products/")
+		if len(parts) > 1 {
+			sub := strings.Split(parts[1], "/")
+			if len(sub) > 0 && sub[0] != "" {
+				_ = os.WriteFile(filepath.Join(cacheDir, sub[0]+".webp"), data, 0644)
+			}
+		}
+	}
+	hash := sha256.Sum256([]byte(rawURL))
+	_ = os.WriteFile(filepath.Join(cacheDir, hex.EncodeToString(hash[:])+".webp"), data, 0644)
+
+	contentType := resp.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "image/webp"
+	}
+	c.Header("Cache-Control", "public, max-age=2592000, immutable")
+	c.Data(http.StatusOK, contentType, data)
+}
+
 func parseDeliveryAuth(c *gin.Context) service.DeliveryLinkAuth {
 	exp := int64(0)
 	if value := strings.TrimSpace(c.Query("exp")); value != "" {

backend/internal/handler/platform_lewan.go

@@ -118,3 +118,38 @@ func (h *PlatformLewanHandler) SyncLewanProduct(c *gin.Context) {
 	}
 	response.WithStatus(c, http.StatusCreated, item)
 }
+
+type batchSyncLewanReq struct {
+	Products []syncLewanProductReq `json:"products" binding:"required,min=1"`
+}
+
+// BatchSyncLewanProducts POST /api/platform/lewan/batch-sync-catalog
+// 批量同步/添加乐玩商品到自营商品目录
+func (h *PlatformLewanHandler) BatchSyncLewanProducts(c *gin.Context) {
+	var req batchSyncLewanReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "参数错误：products 列表不能为空")
+		return
+	}
+
+	actorUserID := middleware.GetUserID(c)
+	inputs := make([]service.SyncLewanProductInput, len(req.Products))
+	for i, p := range req.Products {
+		inputs[i] = service.SyncLewanProductInput{
+			LewanProductID: p.LewanProductID,
+			Name:           p.Name,
+			Category:       p.Category,
+			SKU:            p.SKU,
+			Price:          p.Price,
+			DeliveryType:   p.DeliveryType,
+		}
+	}
+
+	count, err := h.merchantSvc.BatchSyncLewanProductsToCatalog(inputs, actorUserID)
+	if err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+	response.OK(c, gin.H{"synced_count": count})
+}
+