refactor(mission): 优化战斗关卡UI显示与逻辑

1.  调整MissionComp注释与战斗计时获取逻辑
2.  移除关卡波数显示中的总波数限制，只显示当前波数
3.  更新mission.prefab的UI布局与默认显示文本
4.  调整地图prefab的物体位置
5.  修改bg2动画的帧率与时长参数

assets/resources/gui/anim/bg2.anim

@@ -7,11 +7,11 @@
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     },
     "_native": "",
-    "sample": 5,
+    "sample": 1,
     "speed": 1,
     "wrapMode": 2,
     "enableTrsBlending": false,
-    "_duration": 6,
+    "_duration": 30,
     "_hash": 500763545,
     "_tracks": [
       {
@@ -77,7 +77,7 @@
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     "_times": [
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-      6
+      30
     ],
     "_values": [
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@@ -90,7 +90,9 @@
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         "leftTangentWeight": 1,
         "easingMethod": 0,
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+        "__editorExtras__": {
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@@ -102,7 +104,9 @@
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         "leftTangentWeight": 1,
         "easingMethod": 0,
-        "__editorExtras__": null
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     "preExtrapolation": 1,
@@ -118,7 +122,7 @@
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     "_times": [
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-      6
+      30
     ],
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@@ -131,7 +135,9 @@
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+        "__editorExtras__": {
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@@ -143,7 +149,9 @@
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         "easingMethod": 0,
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+        "__editorExtras__": {
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     "preExtrapolation": 1,
@@ -159,7 +167,7 @@
     "__type__": "cc.RealCurve",
     "_times": [
       0,
-      6
+      30
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     "_values": [
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@@ -172,7 +180,9 @@
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@@ -184,7 +194,9 @@
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@@ -251,7 +263,7 @@
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     "_times": [
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-      6
+      30
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@@ -264,7 +276,9 @@
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@@ -276,7 +290,9 @@
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@@ -292,7 +308,7 @@
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-      6
+      30
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@@ -305,7 +321,9 @@
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@@ -317,7 +335,9 @@
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@@ -333,7 +353,7 @@
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@@ -346,7 +366,9 @@
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@@ -358,7 +380,9 @@
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