fix: 移除硬编码，使用数据库配置审批流程

- 数据库已配置审批节点：陈兰 (id=27)
- 数据库已配置抄送节点：陈标 (id=29)
- 移除硬编码的 getDefaultApproversFromConfig() 方法
- 代码从数据库读取配置

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，如果没有配置则返回默认值
+     * 从审批流程配置表中获取
      */
     public function getDefaultApprovers(int $userId): array
     {
@@ -728,11 +728,9 @@ 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' => $defaultApprovers['approvers'],
-                'cc_users' => $defaultApprovers['cc_users'],
+                'approvers' => [],
+                'cc_users' => [],
             ];
         }
 
@@ -783,60 +781,4 @@ 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,
-        ];
-    }
 }