fix(gameplay): 优化敌人碰撞体与新手教程瞄准

- 扩大并重叠 14 个 Enemy 的胸腹部碰撞体
- 消除自动锁定点位于碰撞体边缘的问题
- 移除教程中写死的相机瞄准角度
- 根据目标实时位置动态调整教程相机
- 自动选择与初始镜头夹角最小的存活敌人
- 同步瞄准状态，避免后续滑动发生角度跳变

assets/Prefab/Ememy/ZuoZi2.prefab

@@ -2068,14 +2068,14 @@
     "_center": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0.00532,
+      "y": 0.002,
       "z": 0
     },
     "_size": {
       "__type__": "cc.Vec3",
-      "x": 0.012,
-      "y": 0.011,
-      "z": 0.009
+      "x": 0.016,
+      "y": 0.018,
+      "z": 0.013
     },
     "_id": "c18isQeRlNzKzCwrI0BcI/"
   },
@@ -2191,14 +2191,14 @@
     "_center": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0.00532,
+      "y": 0.003,
       "z": 0
     },
     "_size": {
       "__type__": "cc.Vec3",
-      "x": 0.011,
-      "y": 0.011,
-      "z": 0.009
+      "x": 0.015,
+      "y": 0.017,
+      "z": 0.012
     },
     "_id": "eenOAqh4RH5Kzw/t6jqLTu"
   },
@@ -3968,14 +3968,14 @@
     "_center": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0.00456,
+      "y": 0.0035,
       "z": 0
     },
     "_size": {
       "__type__": "cc.Vec3",
-      "x": 0.012,
-      "y": 0.012,
-      "z": 0.01
+      "x": 0.014,
+      "y": 0.016,
+      "z": 0.012
     },
     "_id": "1coWGf9gJJ8K2+Im0a36vP"
   },