更新二维码合集功能，使用数据库中存储的qrCodeUrl字段显示二维码图片

qr-collection.html

@@ -347,12 +347,12 @@
         `;
         
         inviterQrCodes.forEach(qrCode => {
-          // 生成二维码
-          const qrCodeUrl = `https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=${encodeURIComponent(qrCode.url)}`;
+          // 使用数据库中存储的二维码URL
+          const qrImageUrl = qrCode.qrCodeUrl || `https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=${encodeURIComponent(qrCode.url)}`;
           
           html += `
             <div class="qr-item">
-              <img src="${qrCodeUrl}" alt="邀请二维码">
+              <img src="${qrImageUrl}" alt="邀请二维码">
               <div class="qr-info">
                 <p class="name">${qrCode.inviter || '未知'}</p>
                 <p>${qrCode.inviterProjectName || '无职位'}</p>

server.js

@@ -227,11 +227,11 @@ const server = http.createServer(async (req, res) => {
       let query, params;
       if (isAdmin) {
         // 管理员可以查看所有二维码
-        query = 'SELECT inviter, inviter_phone as inviterPhone, projectName as inviterProjectName, sessionId, DATE_FORMAT(issueDate, "%Y-%m-%d %H:%i:%s") as createdAt FROM certificate GROUP BY sessionId ORDER BY issueDate DESC';
+        query = 'SELECT inviter, inviter_phone as inviterPhone, projectName as inviterProjectName, sessionId, qrCodeUrl, DATE_FORMAT(issueDate, "%Y-%m-%d %H:%i:%s") as createdAt FROM certificate WHERE qrCodeUrl IS NOT NULL GROUP BY sessionId ORDER BY issueDate DESC';
         params = [];
       } else if (userName) {
         // 采购员只能查看自己的二维码
-        query = 'SELECT inviter, inviter_phone as inviterPhone, projectName as inviterProjectName, sessionId, DATE_FORMAT(issueDate, "%Y-%m-%d %H:%i:%s") as createdAt FROM certificate WHERE inviter = ? GROUP BY sessionId ORDER BY issueDate DESC';
+        query = 'SELECT inviter, inviter_phone as inviterPhone, projectName as inviterProjectName, sessionId, qrCodeUrl, DATE_FORMAT(issueDate, "%Y-%m-%d %H:%i:%s") as createdAt FROM certificate WHERE inviter = ? AND qrCodeUrl IS NOT NULL GROUP BY sessionId ORDER BY issueDate DESC';
         params = [userName];
       } else {
         // 未登录用户，返回空列表
@@ -261,6 +261,7 @@ const server = http.createServer(async (req, res) => {
           inviterPhone: row.inviterPhone,
           inviterProjectName: row.inviterProjectName,
           sessionId: row.sessionId,
+          qrCodeUrl: row.qrCodeUrl,
           createdAt: row.createdAt,
           url: url
         };