feat(admin): 添加客服手动接入会话功能并修复时长计算

- 新增 acceptSession 接口支持客服手动接入待分配会话
- 待接入列表显示"接入"按钮，点击后自动分配给当前客服
- 接入前检查客服会话数上限，防止超载
- 修复会话时长计算错误：Unix 时间戳需乘以 1000 转换为毫秒

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

application/admin/view/chat/index.html

@@ -162,6 +162,21 @@
     color: #ddd;
     margin-bottom: 10px;
 }
+.accept-btn {
+    padding: 4px 10px;
+    background: #009688;
+    color: #fff;
+    border: none;
+    border-radius: 4px;
+    font-size: 12px;
+    cursor: pointer;
+    flex-shrink: 0;
+    margin-left: 8px;
+    transition: background 0.2s;
+}
+.accept-btn:hover {
+    background: #00796b;
+}
 
 /* 中间聊天区域 */
 .chat-main {
@@ -766,7 +781,7 @@ layui.use(['layer', 'upload'], function(){
         $.get('/chat/sessions', {status: 1}, function(res) {
             if (res.code === 0) {
                 $('#active-count').text(res.data.length);
-                renderSessionList(res.data, '#session-list');
+                renderSessionList(res.data, '#session-list', false);
             }
         });
     }
@@ -776,13 +791,13 @@ layui.use(['layer', 'upload'], function(){
         $.get('/chat/pending', function(res) {
             if (res.code === 0) {
                 $('#pending-count').text(res.data.length);
-                renderSessionList(res.data, '#pending-list');
+                renderSessionList(res.data, '#pending-list', true);
             }
         });
     }
 
     // 渲染会话列表
-    function renderSessionList(sessions, container) {
+    function renderSessionList(sessions, container, isPending) {
         var html = '';
         if (sessions.length === 0) {
             html = '<div class="sessions-empty">';
@@ -803,20 +818,57 @@ layui.use(['layer', 'upload'], function(){
                 html += '  <div class="session-info">';
                 html += '    <div class="name-row">';
                 html += '      <span class="username">' + username + '</span>';
-                html += '      <span class="time">' + (session.last_msg_time_fmt || '') + '</span>';
+                html += '      <span class="time">' + (session.last_msg_time_fmt || session.create_time_fmt || '') + '</span>';
                 html += '    </div>';
                 html += '    <div class="last-msg">' + lastMsg + '</div>';
                 html += '  </div>';
-                html += unreadBadge;
+                if (isPending) {
+                    html += '  <button class="accept-btn" data-id="' + session.id + '">接入</button>';
+                } else {
+                    html += unreadBadge;
+                }
                 html += '</div>';
             });
         }
         $(container).html(html);
 
         // 绑定点击事件
-        $(container + ' .session-item').click(function() {
+        $(container + ' .session-item').click(function(e) {
+            // 如果点击的是接入按钮，不触发打开会话
+            if ($(e.target).hasClass('accept-btn')) return;
             var sessionId = $(this).data('id');
-            openSession(sessionId);
+            if (!isPending) {
+                openSession(sessionId);
+            }
+        });
+
+        // 绑定接入按钮事件
+        if (isPending) {
+            $(container + ' .accept-btn').click(function(e) {
+                e.stopPropagation();
+                var sessionId = $(this).data('id');
+                acceptSession(sessionId);
+            });
+        }
+    }
+
+    // 接入会话
+    function acceptSession(sessionId) {
+        $.post('/chat/acceptSession', {session_id: sessionId}, function(res) {
+            if (res.code === 0) {
+                layer.msg('接入成功', {icon: 1, time: 1500});
+                loadSessions();
+                loadPendingSessions();
+                // 自动打开刚接入的会话
+                setTimeout(function() {
+                    openSession(sessionId);
+                    // 切换到进行中标签
+                    $('.sessions-tabs .tab-item[data-status="1"]').click();
+                }, 500);
+            } else {
+                layer.msg(res.msg || '接入失败', {icon: 2});
+                loadPendingSessions();
+            }
         });
     }
 
@@ -877,7 +929,8 @@ layui.use(['layer', 'upload'], function(){
     // 会话时长计时器
     function startDurationTimer(startTime) {
         if (durationTimer) clearInterval(durationTimer);
-        sessionStartTime = new Date(startTime).getTime();
+        // startTime 是 Unix 时间戳（秒），需要转换为毫秒
+        sessionStartTime = startTime * 1000;
 
         function updateDuration() {
             var now = Date.now();