revert(order): 移除订单站内聊天，沟通统一走官方客服

- 删除 pages/order/chat、聊天接口/仓储方法/order_messages 建表与客户端 API

- 买家「联系大神」、大神「联系老板」、大神详情「在线客服」、组局「私聊」统一改为 openSupportSheet（读取后台 customer_service 配置的客服微信/热线）

- 保留派单实时通知与雷达/大厅轮询

- 114 套件/742 用例全绿；聊天接口线上已 404

pwuniapp/common/api.js

@@ -706,21 +706,6 @@ export async function getOrdersPool(options = {}) {
   return [];
 }
 
-/**
- * 订单站内聊天（仅交易双方）
- */
-export async function getOrderChat(orderId) {
-  return http.get(`/orders/${encodeURIComponent(orderId)}/chat`);
-}
-
-export async function sendOrderMessage(orderId, content) {
-  return http.post(`/orders/${encodeURIComponent(orderId)}/chat/messages`, { content });
-}
-
-export async function markOrderChatRead(orderId) {
-  return http.post(`/orders/${encodeURIComponent(orderId)}/chat/read`, {});
-}
-
 /**
  * 坐标反查行政区/地址（雷达顶部定位文案）
  */

pwuniapp/common/support.js

@@ -0,0 +1,60 @@
+// pwuniapp/common/support.js
+// 统一客服入口：平台沟通仅通过官方客服微信/热线，不在买卖双方之间直接建立联系。
+import { getPlatformConfigs } from '@/common/api.js';
+
+let cachedContact = null;
+let cachedAt = 0;
+
+export async function getSupportContact() {
+  if (cachedContact && Date.now() - cachedAt < 5 * 60 * 1000) {
+    return cachedContact;
+  }
+  let hotline = '';
+  let wechat = '';
+  try {
+    const configs = await getPlatformConfigs();
+    const cs = (configs && configs.customer_service) || {};
+    hotline = String(cs.hotline || '').trim();
+    wechat = String(cs.wechat || '').trim();
+  } catch (_) {
+    // 配置拉取失败时使用空值，避免展示写死的客服账号
+  }
+  cachedContact = { hotline, wechat };
+  cachedAt = Date.now();
+  return cachedContact;
+}
+
+export async function openSupportSheet() {
+  const contact = await getSupportContact();
+  const actions = [];
+  if (contact.wechat) actions.push({ key: 'wechat', label: `复制客服微信（${contact.wechat}）` });
+  if (contact.hotline) actions.push({ key: 'hotline', label: `拨打客服热线（${contact.hotline}）` });
+
+  if (actions.length === 0) {
+    uni.showToast({ title: '客服信息暂未配置，请稍后再试', icon: 'none' });
+    return;
+  }
+
+  uni.showActionSheet({
+    itemList: actions.map((a) => a.label),
+    success: (res) => {
+      const picked = actions[res.tapIndex];
+      if (!picked) return;
+      if (picked.key === 'wechat') {
+        uni.setClipboardData({
+          data: contact.wechat,
+          success: () => {
+            uni.showToast({ title: '客服微信已复制，请前往微信添加', icon: 'none', duration: 2200 });
+          }
+        });
+      } else if (picked.key === 'hotline') {
+        uni.makePhoneCall({
+          phoneNumber: contact.hotline.replace(/[^0-9+]/g, ''),
+          fail: () => {
+            uni.showToast({ title: `客服热线：${contact.hotline}`, icon: 'none' });
+          }
+        });
+      }
+    }
+  });
+}