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/cmd/cache_images/main.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"time"
+
+	"affiliate_dash/internal/config"
+	"affiliate_dash/internal/pkg/lewan"
+)
+
+func main() {
+	cfg := config.Load()
+	client := lewan.NewClient(lewan.Config{
+		BaseURL:       cfg.LewanBaseURL,
+		AccessKey:     cfg.LewanAccessKey,
+		SecretKey:     cfg.LewanSecretKey,
+		ApplicationID: cfg.LewanApplicationID,
+	}, nil)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	list, err := client.ListProducts(ctx, 1, 100, "")
+	if err != nil {
+		fmt.Printf("ListProducts error: %v\n", err)
+		return
+	}
+
+	fmt.Printf("Found %d products (total: %d)\n", len(list.Items), list.Total)
+	uploadDir := cfg.UploadDir
+	if uploadDir == "" {
+		uploadDir = "data/uploads"
+	}
+	cacheDir := filepath.Join(uploadDir, "products")
+	_ = os.MkdirAll(cacheDir, 0755)
+
+	httpClient := &http.Client{Timeout: 15 * time.Second}
+
+	for i, item := range list.Items {
+		fmt.Printf("[%d/%d] ID: %s, Name: %s, Thumb: %s\n", i+1, len(list.Items), item.ID, item.Name, item.ThumbnailUrl)
+		if item.ThumbnailUrl == "" {
+			continue
+		}
+		// 存储为 item.ID + 原扩展名
+		ext := filepath.Ext(item.ThumbnailUrl)
+		if ext == "" || len(ext) > 5 {
+			ext = ".webp"
+		}
+		destPath := filepath.Join(cacheDir, item.ID+ext)
+		// 同时也用 url hash 存一个软链或备份，以便 proxy 按 url 精准命中
+		urlHash := sha256.Sum256([]byte(item.ThumbnailUrl))
+		hashPath := filepath.Join(cacheDir, hex.EncodeToString(urlHash[:])+ext)
+
+		if _, err := os.Stat(destPath); err == nil {
+			fmt.Printf("   -> 已存在缓存: %s\n", destPath)
+			continue
+		}
+
+		req, err := http.NewRequestWithContext(ctx, http.MethodGet, item.ThumbnailUrl, nil)
+		if err != nil {
+			fmt.Printf("   -> 构建请求失败: %v\n", err)
+			continue
+		}
+		resp, err := httpClient.Do(req)
+		if err != nil {
+			fmt.Printf("   -> 下载失败: %v\n", err)
+			continue
+		}
+		if resp.StatusCode != http.StatusOK {
+			fmt.Printf("   -> 状态码错误: %d\n", resp.StatusCode)
+			resp.Body.Close()
+			continue
+		}
+		data, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			fmt.Printf("   -> 读取失败: %v\n", err)
+			continue
+		}
+
+		_ = os.WriteFile(destPath, data, 0644)
+		_ = os.WriteFile(hashPath, data, 0644)
+		fmt.Printf("   -> 成功缓存: %s (大小: %d 字节)\n", destPath, len(data))
+	}
+}

backend/cmd/server/main.go

@@ -96,6 +96,7 @@ func main() {
 	lewanProvider := service.NewLewanProvider(lewanClient)
 	deliverySvc.RegisterProvider(lewanProvider)
 	fulfillmentSvc.SetUpstreamCancel(deliverySvc.CancelUpstream)
+	fulfillmentSvc.SetUpstreamSync(deliverySvc.SyncDeliveringOrder)
 
 	openlog.Init(cfg.OpenAPIDebug)