feat: 设置默认审批人为陈兰，抄送人为陈标

- 当没有配置审批流程时返回默认值
- 新增 getDefaultApproversFromConfig() 方法
- 默认审批人：陈兰 (id=27)
- 默认抄送人：陈标 (id=29)

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

backend/app/service/BusinessTripService.php

@@ -718,7 +718,7 @@ class BusinessTripService
 
     /**
      * 获取默认审批人和抄送人
-     * 从审批流程配置表中获取
+     * 从审批流程配置表中获取，如果没有配置则返回默认值
      */
     public function getDefaultApprovers(int $userId): array
     {
@@ -728,9 +728,11 @@ class BusinessTripService
             ->first();
 
         if (!$flow) {
+            // 没有配置流程时，返回默认审批人和抄送人
+            $defaultApprovers = $this->getDefaultApproversFromConfig();
             return [
-                'approvers' => [],
+                'approvers' => $defaultApprovers['approvers'],
-                'cc_users' => [],
+                'cc_users' => $defaultApprovers['cc_users'],
             ];
         }
 
@@ -781,4 +783,60 @@ class BusinessTripService
             'cc_users' => $ccUsers,
         ];
     }
+
+    /**
+     * 获取默认配置的审批人和抄送人
+     * 当没有配置审批流程时使用
+     */
+    private function getDefaultApproversFromConfig(): array
+    {
+        // 默认审批人：陈兰 (id=27)
+        // 默认抄送人：陈标 (id=29)
+        $defaultApproverIds = [27];
+        $defaultCcUserIds = [29];
+
+        $approvers = [];
+        $ccUsers = [];
+
+        // 获取审批人信息
+        if (!empty($defaultApproverIds)) {
+            $users = User::whereIn('id', $defaultApproverIds)
+                ->where('status', 1)
+                ->get();
+
+            foreach ($defaultApproverIds as $userId) {
+                $user = $users->firstWhere('id', $userId);
+                if ($user) {
+                    $approvers[] = [
+                        'id' => $user->id,
+                        'name' => $user->name,
+                        'avatar' => $user->avatar,
+                    ];
+                }
+            }
+        }
+
+        // 获取抄送人信息
+        if (!empty($defaultCcUserIds)) {
+            $users = User::whereIn('id', $defaultCcUserIds)
+                ->where('status', 1)
+                ->get();
+
+            foreach ($defaultCcUserIds as $userId) {
+                $user = $users->firstWhere('id', $userId);
+                if ($user) {
+                    $ccUsers[] = [
+                        'id' => $user->id,
+                        'name' => $user->name,
+                        'avatar' => $user->avatar,
+                    ];
+                }
+            }
+        }
+
+        return [
+            'approvers' => $approvers,
+            'cc_users' => $ccUsers,
+        ];
+    }
 }