fix: 充值金额用rules校验(min+number)替代无效的min属性 + 后端NaN防护

wwwroot/proxy_recharge.ui

@@ -52,7 +52,10 @@
                                 "uitype": "float",
                                 "required": true,
                                 "placeholder": "输入充值金额",
-                                "min": 0.01,
+                                "rules": [
+                                    {"type": "number", "message": "充值金额必须是有效数字"},
+                                    {"type": "min", "value": 0.01, "message": "充值金额必须大于0"}
+                                ],
                                 "cwidth": 20
                             }
                         ]

wwwroot/proxy_recharge_submit.dspy

@@ -57,7 +57,7 @@ except (ValueError, TypeError):
 		"options": {"text": "❌ 充值金额格式错误", "color": "#EF4444"}
 	}
 
-if amount <= 0:
+if amount != amount or amount <= 0:
 	return {
 		"widgettype": "Text",
 		"options": {"text": "❌ 充值金额必须大于0", "color": "#EF4444"}