RunNode 接入游戏主流程

- NodeMapForm：节点地图
    - NodeItem：节点入口

Assets/GameMain/Scripts/CustomComponent/CombatNode/CombatNodeComponent.cs

@@ -174,7 +174,7 @@ namespace GeometryTD.CustomComponent
             EnsureCombatRuntimeInitialized();
         }
 
-        public void StartCombat()
+        public void StartCombat(int levelId = 0)
         {
             if (!EnsureCombatRuntimeInitialized())
             {
@@ -182,9 +182,14 @@ namespace GeometryTD.CustomComponent
                 return;
             }
 
-            if (!TrySelectRandomLevel(out DRLevel selectedLevel))
+            bool hasLevel = levelId > 0
+                ? TryGetLevelById(levelId, out DRLevel selectedLevel)
+                : TrySelectRandomLevel(out selectedLevel);
+            if (!hasLevel)
             {
-                Log.Warning("CombatNodeComponent has no level cache. Call OnInit(levelThemeType) first.");
+                Log.Warning(
+                    "CombatNodeComponent start failed. LevelId={0}. Missing cached level data or invalid level id.",
+                    levelId);
                 return;
             }
 
@@ -348,6 +353,17 @@ namespace GeometryTD.CustomComponent
             return _levelsById.TryGetValue(selectedLevelId, out level);
         }
 
+        private bool TryGetLevelById(int levelId, out DRLevel level)
+        {
+            level = null;
+            if (levelId <= 0)
+            {
+                return false;
+            }
+
+            return _levelsById.TryGetValue(levelId, out level);
+        }
+
         private int CountPhases()
         {
             int count = 0;