feat: 调整游戏界面布局和地平线高度

- 提升游戏地平线高度（GAME_LINE从-140改为-90），优化视觉体验
- 删除未使用的MissionGetsComp组件及相关资源文件
- 调整地图预制体中多个节点的Y坐标位置
- 修改角色控制器UI元素的位置、大小和间距
- 更新UI容器的高度和底部边距以适应新布局

assets/resources/game/map/map_rpg.prefab

@@ -584,7 +584,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -245.746,
+      "y": -195.746,
       "z": 0
     },
     "_lrot": {
@@ -720,7 +720,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 52.571,
+      "y": 102.571,
       "z": 0
     },
     "_lrot": {
@@ -856,7 +856,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -228.047,
+      "y": -128.047,
       "z": 0
     },
     "_lrot": {
@@ -992,7 +992,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -232.963,
+      "y": -132.963,
       "z": 0
     },
     "_lrot": {
@@ -1128,7 +1128,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -530.208,
+      "y": -480.208,
       "z": 0
     },
     "_lrot": {
@@ -1267,7 +1267,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -270,
+      "y": -220,
       "z": 0
     },
     "_lrot": {
@@ -1383,7 +1383,7 @@
     "_left": 0,
     "_right": 0,
     "_top": 0,
-    "_bottom": -220,
+    "_bottom": -170,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,
     "_isAbsLeft": true,