fix(UI): 改进UI路径查找的错误信息并优化字符串比较

将模糊的"error path"异常信息替换为具体描述，明确指示索引越界、子对象未找到或非容器组件等具体问题。
优化字符串比较，使用StringComparison.OrdinalIgnoreCase进行不区分大小写的比较，避免创建临时字符串。
移除不必要的代码块，简化逻辑结构。

Author: AlianBlank

Runtime/FairyGUIPathFinderHelper.cs

@@ -175,7 +175,7 @@ private static GObject SearchChild(GComponent o, Queue<string> q)
 
                     if (index < 0 || index >= o.numChildren)
                     {
-                        throw new Exception("eror path");
+                        throw new Exception("Invalid UI path: index out of range");
                     }
 
                     child = o.GetChildAt(index);
@@ -188,7 +188,7 @@ private static GObject SearchChild(GComponent o, Queue<string> q)
 
             if (child == null)
             {
-                throw new Exception("error path");
+                throw new Exception("Invalid UI path: child not found");
             }
 
             if (q.Count <= 0)
@@ -202,7 +202,7 @@ private static GObject SearchChild(GComponent o, Queue<string> q)
                 return SearchChild(child as GComponent, q);
             }
 
-            throw new Exception("error path");
+            throw new Exception("Invalid UI path: not a GComponent");
         }
 
         /// <summary>
@@ -217,7 +217,7 @@ private static GObject SearchChild(GComponent o, Queue<string> q)
         [UnityEngine.Scripting.Preserve]
         public static bool SearchPathInclude(string path, GObject gObject)
         {
-            if ("all".ToLower() == path)
+            if (string.Equals(path, "all", StringComparison.OrdinalIgnoreCase))
             {
                 return false;
             }
@@ -267,9 +267,7 @@ public static bool SearchPathInclude(string path, GObject gObject)
                         continue;
                     }
 
-                    {
-                        return false;
-                    }
+                    return false;
                 }
 
                 return false;