feat(技能盒): 添加技能盒销毁事件与自动排列功能

- 新增 RemoveSkillBox 事件用于技能盒销毁时通知
- 在 SkillBoxComp 销毁时触发 RemoveSkillBox 事件
- 为 MissSkillsComp 实现技能盒槽位管理系统
- 技能盒添加时会自动分配到可用槽位
- 技能盒销毁后会自动重新排列剩余技能盒
- 调整技能盒预制体尺寸和位置以优化显示效果

assets/resources/gui/element/sbox.prefab

@@ -105,7 +105,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 40,
+      "y": 35,
       "z": 0
     },
     "_lrot": {
@@ -145,8 +145,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 80,
-      "height": 80
+      "width": 70,
+      "height": 70
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -287,7 +287,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 40,
+      "y": 35,
       "z": 0
     },
     "_lrot": {
@@ -349,8 +349,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": 1,
-      "y": 1,
+      "x": 0.9,
+      "y": 0.9,
       "z": 1
     },
     "_mobility": 0,
@@ -377,8 +377,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 100,
-      "height": 100
+      "width": 78,
+      "height": 78
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -417,7 +417,7 @@
       "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08@f4f28",
       "__expectedType__": "cc.SpriteFrame"
     },
-    "_type": 0,
+    "_type": 1,
     "_fillType": 0,
     "_sizeMode": 0,
     "_fillCenter": {
@@ -463,8 +463,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 78,
-      "height": 78
+      "width": 68,
+      "height": 68
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -623,7 +623,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 40,
+      "y": 35,
       "z": 0
     },
     "_lrot": {
@@ -663,8 +663,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 76,
-      "height": 76
+      "width": 66,
+      "height": 66
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -798,7 +798,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 40,
+      "y": 35,
       "z": 0
     },
     "_lrot": {
@@ -838,8 +838,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 68,
-      "height": 68
+      "width": 58,
+      "height": 58
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -973,7 +973,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 40,
+      "y": 35,
       "z": 0
     },
     "_lrot": {
@@ -1013,8 +1013,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 80,
-      "height": 80
+      "width": 70,
+      "height": 70
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -1294,8 +1294,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 80,
-      "height": 80
+      "width": 70,
+      "height": 70
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",