Add final evaluation report for Minimap system after all fixes and improvements

- Summarized the evolution of scores across five review rounds
- Detailed the status of each evaluation dimension post-fixes
- Highlighted remaining issues and recommended future work for further enhancements
- Compared current system against industry benchmarks

Assets/_Game/Scripts/World/Map/MapGridConstants.cs

@@ -0,0 +1,12 @@
+namespace BaseGames.World.Map
+{
+    /// <summary>
+    /// 地图格子渲染常量。
+    /// 统一管理像素/格比例，避免魔法数字分散在多个文件中。
+    /// </summary>
+    public static class MapGridConstants
+    {
+        /// <summary>全屏地图每格像素数（MapPanel / MapRoomCellUI 使用）。</summary>
+        public const float FullMapCellPixels = 32f;
+    }
+}