添加气泡布局组件，基于物理仿真的布局组件。

Runtime/BubbleLayout/BubbleItemData.cs

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+using System;
+using UnityEngine;
+
+namespace XericUI.BubbleLayout
+{
+	/// <summary>
+	/// 气泡布局中每个子UI元素的物理状态数据
+	/// </summary>
+	[Serializable]
+	public class BubbleItemData
+	{
+		/// <summary>
+		/// 关联的 RectTransform
+		/// </summary>
+		[NonSerialized]
+		public RectTransform rectTransform;
+
+		/// <summary>
+		/// 唯一标识键（名称+实例ID格式）
+		/// </summary>
+		public string Key;
+
+		/// <summary>
+		/// 当前动画位置（世界/局部坐标，取决于布局设置）
+		/// </summary>
+		public Vector2 position;
+
+		/// <summary>
+		/// UI元素尺寸
+		/// </summary>
+		public Vector2 size;
+
+		/// <summary>
+		/// 旋转角度（度）
+		/// </summary>
+		public float rotation;
+
+		// --- 物理状态 ---
+
+		/// <summary>当前速度</summary>
+		public Vector2 velocity;
+
+		/// <summary>上一帧速度</summary>
+		public Vector2 prevVelocity;
+
+		/// <summary>当前受到的力</summary>
+		public Vector2 force;
+
+		/// <summary>上一帧受到的力</summary>
+		public Vector2 prevForce;
+
+		/// <summary>动量</summary>
+		public Vector2 momentum;
+
+		/// <summary>角动量</summary>
+		public float angularMomentum;
+
+		/// <summary>质量（默认=1）</summary>
+		public float mass = 1f;
+
+		/// <summary>
+		/// 获取以position为中心的Rect
+		/// </summary>
+		public Rect GetRect()
+		{
+			return new Rect(position.x - size.x * 0.5f, position.y - size.y * 0.5f, size.x, size.y);
+		}
+
+		/// <summary>
+		/// 从RectTransform构建数据
+		/// </summary>
+		public static BubbleItemData FromRectTransform(RectTransform rt)
+		{
+			var data = new BubbleItemData
+			{
+				rectTransform = rt,
+				Key = $"{rt.name}_{rt.GetInstanceID()}",
+				position = rt.anchoredPosition,
+				size = rt.rect.size,
+				rotation = rt.localEulerAngles.z,
+				velocity = Vector2.zero,
+				prevVelocity = Vector2.zero,
+				force = Vector2.zero,
+				prevForce = Vector2.zero,
+				momentum = Vector2.zero,
+				angularMomentum = 0f,
+				mass = 1f,
+			};
+			return data;
+		}
+
+		/// <summary>
+		/// 将当前position应用回RectTransform
+		/// </summary>
+		public void ApplyToTransform()
+		{
+			if (rectTransform != null)
+			{
+				rectTransform.anchoredPosition = position;
+			}
+		}
+	}
+}