[optimize][axis] support auto float min-max range

Runtime/Component/Radar/RadarCoord.cs

@@ -103,7 +103,7 @@ namespace XCharts.Runtime
         [SerializeField] private bool m_Indicator = true;
         [SerializeField] private PositionType m_PositionType = PositionType.Vertice;
         [SerializeField] private float m_IndicatorGap = 10;
-        [SerializeField] private int m_CeilRate = 0;
+        [SerializeField] private double m_CeilRate = 0;
         [SerializeField] private bool m_IsAxisTooltip;
         [SerializeField] private Color32 m_OutRangeColor = Color.red;
         [SerializeField] private bool m_ConnectCenter = false;
@@ -214,7 +214,7 @@ namespace XCharts.Runtime
         /// The ratio of maximum and minimum values rounded upward. The default is 0, which is automatically calculated.
         /// |最大最小值向上取整的倍率。默认为0时自动计算。
         /// </summary>
-        public int ceilRate
+        public double ceilRate
         {
             get { return m_CeilRate; }
             set { if (PropertyUtil.SetStruct(ref m_CeilRate, value < 0 ? 0 : value)) SetAllDirty(); }