fix: 充值投诉仅允许已支付流水（前后端硬拦）

Co-authored-by: Cursor <cursoragent@cursor.com>

gongdan/services.py

@@ -156,8 +156,16 @@ def validate_type_refs(leixing, order_id=None, chongzhi_id=None, fadan_id=None,
         if not chongzhi_id:
             raise GongdanError('充值投诉请填写充值记录ID', 'need_chongzhi_id')
         from products.models import Czjilu
-        if not Czjilu.query.filter(dingdan_id=chongzhi_id).exists():
+        from products.czjilu_types import CZJILU_PAID_STATUS
+        cz = Czjilu.query.filter(dingdan_id=chongzhi_id).first()
+        if not cz:
             raise GongdanError('充值记录不存在，请核对充值ID', 'chongzhi_not_found')
+        try:
+            z = int(cz.zhuangtai) if cz.zhuangtai is not None else None
+        except (TypeError, ValueError):
+            z = None
+        if z != CZJILU_PAID_STATUS:
+            raise GongdanError('仅已支付的充值单可投诉', 'chongzhi_not_paid')
         return None, chongzhi_id, None, None
 
     if leixing == TYPE_PENALTY: