refactor(oilPriceManage): 修改燃料油型号字段为非必填

- 将 fuelModel 字段的规则从 required 修改为非 required
- 此修改提高了表单的灵活性，允许用户在某些情况下不输入油型号

src/views/workStation/oilPriceManage.vue

@@ -160,7 +160,7 @@ const rules = reactive({
   fuelShipLatitude: [
     { required: true, message: "请输入纬度", trigger: "blur" },
   ],
-  fuelModel: [{ required: true, message: "请输入油型号", trigger: "blur" }],
+  fuelModel: [{ required: false, message: "请输入油型号", trigger: "blur" }],
   price: [{ required: true, message: "请输入价格", trigger: "blur" }],
   priceDate: [{ required: true, message: "请选择发布日期", trigger: "change" }],
 });