Add refund received toggle button and filter options

- Add refund_received column to claude_payment_status table
- API endpoint POST /api/tools/refund-received/{email} to toggle
- Clickable badge in table to mark refund as received/not received
- Filter options: refund received / refund not received

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mail_api.py

@@ -1270,6 +1270,23 @@ async def update_claude_payment_note(email: str, request: dict) -> ApiResponse:
         return ApiResponse(success=True, message="保存成功")
     return ApiResponse(success=False, message="保存失败")
 
+@app.post("/api/tools/refund-received/{email}")
+async def toggle_refund_received(email: str) -> ApiResponse:
+    """切换退款已收到状态"""
+    email = email.strip()
+    try:
+        status = await db_manager.get_claude_payment_status(email)
+        current = status.get('refund_received', '0') if status else '0'
+        new_val = '0' if current == '1' else '1'
+        ok = await db_manager.update_claude_payment_note(email, refund_received=new_val)
+        if ok:
+            await cache.invalidate_payment()
+            return ApiResponse(success=True, data={"refund_received": new_val})
+        return ApiResponse(success=False, message="更新失败")
+    except Exception as e:
+        logger.error(f"切换退款状态失败: {e}")
+        return ApiResponse(success=False, message="操作失败")
+
 @app.get("/api/tools/claude-payment-status")
 async def get_claude_payment_status() -> ApiResponse:
     """获取所有账户的Claude支付缓存状态"""