feat: 商家退款申请支持证据图片

新增 tuikuantupian 表；申请退款必传图片；打手详情与客服订单详情返回退款图。

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

orders/models.py

@@ -17,6 +17,7 @@
 - **PenaltyRecord** — 处罚记录
 - **PenaltyEvidenceImage** — 处罚证据图片
 - **RefundRecord** — 退款记录
+- **RefundEvidenceImage** — 退款申请证据图片
 - **PlatformCashFlow** — 平台流水统计
 - **ChatSession** — 聊天会话
 """
@@ -866,6 +867,38 @@ class PenaltyEvidenceImage(QModel):
         ]
 
 
+class RefundEvidenceImage(QModel):
+    """退款申请证据图片表"""
+
+    OrderID = models.CharField(
+        max_length=32, db_index=True, null=True,
+        db_column='dingdan_id', verbose_name='订单ID',
+    )
+    UserID = models.CharField(
+        max_length=32, null=True, blank=True, db_index=True,
+        db_column='yonghuid', verbose_name='用户ID',
+    )
+    ImageURL = models.CharField(
+        max_length=500, null=True, blank=True,
+        db_column='tupian', verbose_name='证据图片URL',
+    )
+    CreateTime = models.DateTimeField(
+        auto_now_add=True,
+        verbose_name='创建时间',
+    )
+    UpdateTime = models.DateTimeField(
+        auto_now=True,
+        verbose_name='更新时间',
+    )
+
+    class Meta:
+        db_table = 'tuikuantupian'
+        indexes = [
+            models.Index(fields=['UserID']),
+            models.Index(fields=['OrderID']),
+        ]
+
+
 class RefundRecord(QModel):
     """退款记录表"""