feat: 添加"抄送我的"审批列表选项

后端修改：
- ApprovalService::getList 添加 'cc' 类型查询
- 从 form_data.cc_users 中查找包含当前用户的订单
- 兼容两种数据格式：[{id:29}] 或 [29]

前端修改：
- 添加"抄送我的"标签页
- 更新类型定义支持 'cc' 类型
- approvalListParams 类型添加 'cc' 选项

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

backend/app/service/ApprovalService.php

@@ -203,6 +203,36 @@ class ApprovalService
                 $query->whereIn('id', $approvedOrderIds)
                     ->whereIn('status', [ApprovalOrder::STATUS_APPROVED, ApprovalOrder::STATUS_REJECTED, ApprovalOrder::STATUS_CANCELLED]);
                 break;
+            case 'cc':
+                // 获取抄送给我的订单
+                $allOrders = ApprovalOrder::where('status', '!=', ApprovalOrder::STATUS_DRAFT)->get();
+                $ccOrderIds = [];
+
+                foreach ($allOrders as $order) {
+                    $formData = $order->form_data ?? [];
+                    $ccUsers = $formData['cc_users'] ?? [];
+
+                    // 兼容两种格式：[{id:29, name:'...'}] 或 [29] 或 [{id:29}]
+                    if (!empty($ccUsers)) {
+                        if (is_array($ccUsers[0] ?? null) && isset($ccUsers[0]['id'])) {
+                            // 对象数组格式: [{id:29, name:'...'}]
+                            $ccUserIds = array_column($ccUsers, 'id');
+                        } else if (is_numeric($ccUsers[0] ?? null)) {
+                            // ID数组格式: [29, 30]
+                            $ccUserIds = $ccUsers;
+                        } else {
+                            $ccUserIds = [];
+                        }
+
+                        if (in_array($userId, $ccUserIds)) {
+                            $ccOrderIds[] = $order->id;
+                        }
+                    }
+                }
+
+                error_log("🔍 Debug 'cc' query: userId={$userId}, ccOrderIds=" . json_encode($ccOrderIds));
+                $query->whereIn('id', $ccOrderIds);
+                break;
         }
 
         $total = $query->count();