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

server/src/db/mysql.ts

@@ -159,21 +159,6 @@ export async function initDatabase(): Promise<void> {
       ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
     `);
 
-    // 订单维度站内聊天消息（仅交易双方可见，敏感词/联系方式在服务端拦截）
-    await conn.query(`
-      CREATE TABLE IF NOT EXISTS order_messages (
-        id VARCHAR(64) PRIMARY KEY,
-        order_id VARCHAR(64) NOT NULL,
-        sender_id INT NOT NULL,
-        receiver_id INT NOT NULL,
-        content TEXT NOT NULL,
-        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-        read_at DATETIME NULL,
-        INDEX idx_order_created (order_id, created_at),
-        INDEX idx_receiver_read (receiver_id, read_at)
-      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
-    `);
-
     const extraOrderCols = [
       "ALTER TABLE orders ADD COLUMN buyer_id INT DEFAULT 1001 AFTER id",
       "ALTER TABLE orders ADD COLUMN expert_id INT DEFAULT 101 AFTER buyer_id",

server/src/db/repository.ts

@@ -1686,66 +1686,6 @@ export class MysqlRepository {
     };
   }
 
-  /** 订单聊天上下文：仅买家与已认领大神可参与 */
-  async getOrderChatContext(orderId: string): Promise<any | null> {
-    const own = await this.getOrderOwnership(orderId);
-    if (!own) return null;
-    return {
-      orderId: own.id,
-      orderNo: own.orderNo,
-      buyerId: own.buyerId,
-      expertUserId: Number(own.claimedBy) || 0,
-      status: own.status,
-      amount: own.amount,
-      companionName: own.companionName,
-    };
-  }
-
-  async listOrderMessages(orderId: string, limit = 100): Promise<any[]> {
-    const safeLimit = Math.min(200, Math.max(1, Math.round(Number(limit) || 100)));
-    const [rows]: any = await pool.query(`
-      SELECT id, order_id as orderId, sender_id as senderId, receiver_id as receiverId,
-             content, created_at as createdAt, read_at as readAt
-      FROM order_messages
-      WHERE order_id = ?
-      ORDER BY created_at ASC
-      LIMIT ?
-    `, [orderId, safeLimit]);
-    return rows || [];
-  }
-
-  async createOrderMessage(orderId: string, senderId: number, receiverId: number, content: string): Promise<any> {
-    const id = `msg_${Date.now()}_${Math.floor(100 + Math.random() * 900)}`;
-    await pool.query(
-      'INSERT INTO order_messages (id, order_id, sender_id, receiver_id, content) VALUES (?, ?, ?, ?, ?)',
-      [id, orderId, senderId, receiverId, content]
-    );
-    return {
-      id,
-      orderId,
-      senderId: Number(senderId),
-      receiverId: Number(receiverId),
-      content,
-      createdAt: new Date().toISOString(),
-      readAt: null,
-    };
-  }
-
-  async markOrderMessagesRead(orderId: string, readerId: number): Promise<void> {
-    await pool.query(
-      'UPDATE order_messages SET read_at = NOW() WHERE order_id = ? AND receiver_id = ? AND read_at IS NULL',
-      [orderId, readerId]
-    );
-  }
-
-  async countUnreadOrderMessages(orderId: string, receiverId: number): Promise<number> {
-    const [rows]: any = await pool.query(
-      'SELECT COUNT(*) as c FROM order_messages WHERE order_id = ? AND receiver_id = ? AND read_at IS NULL',
-      [orderId, receiverId]
-    );
-    return Number(rows?.[0]?.c || 0);
-  }
-
   // 大神点击申请完成服务 (服务中 -> 待确认，进入 48 小时买家确认窗口)
   async applyCompleteOrder(orderId: string): Promise<any> {
     const [cur]: any = await pool.query('SELECT status FROM orders WHERE id = ? OR order_no = ? LIMIT 1', [orderId, orderId]);