fix: 修复审批列表首次加载不显示和发起人审批人问题

- 移除 loadingRef，解决 React 18 StrictMode 下请求阻塞问题
- 提交申请时根据选择的审批人动态创建/更新审批节点
- 修改申请提交后跳转到审批列表而非出差列表
- 更新 PROJECT_ISSUES.md 记录所有问题和解决方案

修复问题：
1. 首次进入审批列表"我发起的"不显示数据
2. 发起人也是审批人时"待我审批"不显示
3. 申请提交后跳转到错误的页面

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

backend/app/service/BusinessTripService.php

@@ -123,7 +123,7 @@ class BusinessTripService
                 throw new \Exception('审批人和抄送人不能是同一个人');
             }
 
-            // 获取审批流程（简化版：直接使用第一个审批人作为单人审批）
+            // 获取审批流程
             $flow = ApprovalFlow::where('business_type', 'business_trip')
                 ->where('status', 1)
                 ->first();
@@ -138,6 +138,49 @@ class BusinessTripService
                 ]);
             }
 
+            // 根据审批人创建审批节点
+            $approverIds = array_column($approvers, 'id');
+            $node = ApprovalNode::where('flow_id', $flow->id)
+                ->where('order', 0)
+                ->first();
+
+            if (!$node) {
+                // 创建第一个审批节点
+                $node = ApprovalNode::create([
+                    'flow_id' => $flow->id,
+                    'type' => count($approverIds) > 1 ? 'and_approve' : 'approver',
+                    'name' => '审批',
+                    'order' => 0,
+                    'approvers' => $approverIds,
+                ]);
+            } else {
+                // 更新现有节点的审批人
+                $node->approvers = $approverIds;
+                $node->save();
+            }
+
+            // 创建抄送节点（如果有抄送人）
+            $ccUserIds = array_column($ccUsers, 'id');
+            if (!empty($ccUserIds)) {
+                $ccNode = ApprovalNode::where('flow_id', $flow->id)
+                    ->where('type', 'notify')
+                    ->where('order', 1)
+                    ->first();
+
+                if (!$ccNode) {
+                    ApprovalNode::create([
+                        'flow_id' => $flow->id,
+                        'type' => 'notify',
+                        'name' => '抄送',
+                        'order' => 1,
+                        'approvers' => $ccUserIds,
+                    ]);
+                } else {
+                    $ccNode->approvers = $ccUserIds;
+                    $ccNode->save();
+                }
+            }
+
             // 创建审批单
             $approvalOrder = ApprovalOrder::create([
                 'business_type' => 'business_trip',
@@ -145,7 +188,7 @@ class BusinessTripService
                 'title' => '出差申请 - ' . $businessTrip->user->name,
                 'applicant_id' => $userId,
                 'status' => ApprovalOrder::STATUS_PENDING,
-                'current_nodes' => [1], // 简化：使用节点1
+                'current_nodes' => [$node->id], // 使用创建的节点 ID
                 'flow_id' => $flow->id,
                 'form_data' => [
                     'reason' => $businessTrip->reason,
@@ -165,8 +208,8 @@ class BusinessTripService
             // 记录提交操作
             ApprovalRecord::create([
                 'order_id' => $approvalOrder->id,
-                'node_id' => 1,
-                'node_type' => 'single_approve',
+                'node_id' => $node->id,
+                'node_type' => $node->type,
                 'approver_id' => $userId,
                 'action' => 'submit',
                 'comment' => null,