feat: 审批功能优化和拒绝原因弹窗

后端改动：
- ApprovalService: 添加调试日志，简化详情页 URL 生成逻辑
- BusinessTripService: 优化出差审批详情展示

前端改动：
- approval/detail: 审批详情页优化，支持查看完整审批流程
- approval/reject: 新增拒绝原因弹窗组件
- business-trip/detail: 出差详情页增强，展示审批状态和操作

功能特性：
- 审批详情页显示完整审批流程和记录
- 拒绝操作支持填写拒绝原因
- 出差申请详情页优化展示

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/service/BusinessTripService.php

@@ -295,12 +295,9 @@ class BusinessTripService
                 return;
             }
 
-            // 构建审批链接（使用 approval_order 的 ID）
+            // 构建审批链接（统一使用审批详情页）
             $approvalUrl = "https://xsm.dev.hnxinyouhe.com/approval/detail/{$approvalOrder->id}";
 
-            // 构建业务详情链接（用于查看详情按钮）
-            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
-
             // 构建内容
             $content = "**出差原因**: {$businessTrip->reason}\n";
             $content .= "**目的地**: {$businessTrip->destination}\n";
@@ -317,7 +314,7 @@ class BusinessTripService
                             'applicant' => $businessTrip->user->name,
                             'type' => '出差申请',
                             'content' => $content,
-                            'url' => $detailUrl,
+                            'url' => $approvalUrl,
                             'order_id' => $approvalOrder->id,  // 添加 order_id 以显示审批按钮
                         ]);
                     error_log("✅ 审批人通知成功: approver_id={$approverId}");
@@ -356,7 +353,16 @@ class BusinessTripService
     {
         try {
             $notificationService = new \app\service\FeishuNotificationService();
-            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
+
+            // 获取关联的审批订单
+            $approvalOrder = \app\model\ApprovalOrder::where('business_id', $businessTrip->id)
+                ->where('business_type', 'business_trip')
+                ->first();
+
+            // 统一使用审批详情页
+            $detailUrl = $approvalOrder
+                ? "https://xsm.dev.hnxinyouhe.com/approval/detail/{$approvalOrder->id}"
+                : "https://xsm.dev.hnxinyouhe.com/approval/list";
 
             if ($action === 'approve') {
                 $title = '出差申请已通过';
@@ -642,7 +648,9 @@ class BusinessTripService
     {
         try {
             $notificationService = new \app\service\FeishuNotificationService();
-            $detailUrl = "https://xsm.dev.hnxinyouhe.com/business-trip/detail/{$businessTrip->id}";
+
+            // 统一使用审批详情页
+            $detailUrl = "https://xsm.dev.hnxinyouhe.com/approval/detail/{$approvalOrder->id}";
 
             // 获取审批人和抄送人
             $formData = $approvalOrder->form_data ?? [];