chore: 更新图集资源与布局配置

1.  更新umps.png纹理图集与plist配置，调整所有精灵的裁剪偏移、旋转状态与纹理坐标
2.  修改mission.prefab的横向间距为40
3.  调整loading.prefab的加载图标缩放与尺寸，并替换精灵帧资源

assets/resources/loading/prefab/loading.prefab

@@ -1819,8 +1819,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": 2,
-      "y": 2,
+      "x": 0.8,
+      "y": 0.8,
       "z": 1
     },
     "_mobility": 0,
@@ -1847,8 +1847,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 218,
-      "height": 166
+      "width": 799,
+      "height": 332
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -1884,7 +1884,7 @@
       "a": 255
     },
     "_spriteFrame": {
-      "__uuid__": "cb93c900-b440-4571-91d1-7da1636e3d73@e5c7b",
+      "__uuid__": "d7d869bc-06aa-4876-806f-487e68b96780@d2fc0",
       "__expectedType__": "cc.SpriteFrame"
     },
     "_type": 0,
@@ -1900,7 +1900,7 @@
     "_isTrimmedMode": true,
     "_useGrayscale": false,
     "_atlas": {
-      "__uuid__": "cb93c900-b440-4571-91d1-7da1636e3d73",
+      "__uuid__": "d7d869bc-06aa-4876-806f-487e68b96780",
       "__expectedType__": "cc.SpriteAtlas"
     },
     "_id": ""