[AI] Behavior Actions 시스템 추가

Ultraworked with [Sisyphus](https://github.com/code-yeonggu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/Scripts/AI/BehaviorActions/Conditions/HasTargetCondition.cs

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+using System;
+using UnityEngine;
+using Unity.Behavior;
+using Unity.Properties;
+using Condition = Unity.Behavior.Condition;
+
+namespace Colosseum.AI.BehaviorActions.Conditions
+{
+    /// <summary>
+    /// 타겟이 존재하는지 확인합니다.
+    /// </summary>
+    [Serializable, GeneratePropertyBag]
+    [NodeDescription(name: "Has Target", story: "Has [Target]", category: "Combat")]
+    public partial class HasTargetCondition : Condition
+    {
+        [SerializeReference]
+        public BlackboardVariable<GameObject> Target;
+
+        public override bool IsTrue()
+        {
+            return Target.Value != null && Target.Value.activeInHierarchy;
+        }
+    }
+}

Assets/Scripts/AI/BehaviorActions/Conditions/HasTargetCondition.cs.meta

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+fileFormatVersion: 2
+guid: 5aba729f8b5ddea468304d6b1bf43dce

Assets/Scripts/AI/BehaviorActions/Conditions/IsHealthBelowCondition.cs

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+using System;
+using UnityEngine;
+using Unity.Behavior;
+using Unity.Properties;
+using Condition = Unity.Behavior.Condition;
+using Colosseum.Enemy;
+
+namespace Colosseum.AI.BehaviorActions.Conditions
+{
+    /// <summary>
+    /// 체력이 지정된 비율 이하인지 확인합니다.
+    /// </summary>
+    [Serializable, GeneratePropertyBag]
+    [NodeDescription(name: "Is Health Below", story: "Check if health is below [HealthPercent] percent", category: "Combat")]
+    public partial class IsHealthBelowCondition : Condition
+    {
+        [SerializeReference]
+        public BlackboardVariable<float> HealthPercent = new BlackboardVariable<float>(50f);
+
+        public override bool IsTrue()
+        {
+            EnemyBase enemy = GameObject.GetComponent<EnemyBase>();
+            
+            if (enemy == null)
+            {
+                return false;
+            }
+
+            float currentHealthPercent = (enemy.CurrentHealth / enemy.MaxHealth) * 100f;
+            return currentHealthPercent <= HealthPercent.Value;
+        }
+    }
+}

Assets/Scripts/AI/BehaviorActions/Conditions/IsHealthBelowCondition.cs.meta

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+fileFormatVersion: 2
+guid: e03ad43d6a068dd44bef3d524d20a4c1

Assets/Scripts/AI/BehaviorActions/Conditions/IsInAttackRangeCondition.cs

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+using System;
+using UnityEngine;
+using Unity.Behavior;
+using Unity.Properties;
+using Condition = Unity.Behavior.Condition;
+
+namespace Colosseum.AI.BehaviorActions.Conditions
+{
+    /// <summary>
+    /// 타겟이 공격 사거리 내에 있는지 확인합니다.
+    /// </summary>
+    [Serializable, GeneratePropertyBag]
+    [NodeDescription(name: "Is In Attack Range", story: "Is [Target] within [Range]", category: "Combat")]
+    public partial class IsInAttackRangeCondition : Condition
+    {
+        [SerializeReference]
+        public BlackboardVariable<GameObject> Target;
+        
+        [SerializeReference]
+        public BlackboardVariable<float> Range = new BlackboardVariable<float>(2f);
+
+        public override bool IsTrue()
+        {
+            if (Target.Value == null)
+            {
+                return false;
+            }
+
+            float distance = Vector3.Distance(
+                GameObject.transform.position,
+                Target.Value.transform.position
+            );
+
+            return distance <= Range.Value;
+        }
+    }
+}

Assets/Scripts/AI/BehaviorActions/Conditions/IsInAttackRangeCondition.cs.meta

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+fileFormatVersion: 2
+guid: 10007872b79b2b641980c0d8dfd4f6a4

Assets/Scripts/AI/BehaviorActions/Conditions/IsInRangeCondition.cs

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+using System;
+using UnityEngine;
+using Unity.Behavior;
+using Unity.Properties;
+using Condition = Unity.Behavior.Condition;
+
+namespace Colosseum.AI.BehaviorActions.Conditions
+{
+    /// <summary>
+    /// 타겟이 지정된 거리 내에 있는지 확인합니다.
+    /// </summary>
+    [Serializable, GeneratePropertyBag]
+    [NodeDescription(name: "Is In Range", story: "Is [Target] within [Range] distance", category: "Combat")]
+    public partial class IsInRangeCondition : Condition
+    {
+        [SerializeReference]
+        public BlackboardVariable<GameObject> Target;
+
+        [SerializeReference]
+        public BlackboardVariable<float> Range = new BlackboardVariable<float>(2f);
+
+        public override bool IsTrue()
+        {
+            if (Target.Value == null)
+            {
+                return false;
+            }
+
+            float distance = Vector3.Distance(GameObject.transform.position, Target.Value.transform.position);
+            return distance <= Range.Value;
+        }
+    }
+}

Assets/Scripts/AI/BehaviorActions/Conditions/IsInRangeCondition.cs.meta

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+fileFormatVersion: 2
+guid: 0035b82da5a602d44b552684970273a8

Assets/Scripts/AI/BehaviorActions/Conditions/RandomChanceCondition.cs

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+using System;
+using UnityEngine;
+using Unity.Behavior;
+using Unity.Properties;
+using Condition = Unity.Behavior.Condition;
+
+namespace Colosseum.AI.BehaviorActions.Conditions
+{
+    /// <summary>
+    /// 무작위 확률로 성공/실패를 반환합니다.
+    /// </summary>
+    [Serializable, GeneratePropertyBag]
+    [NodeDescription(name: "Random Chance", story: "Random chance of [Chance] percent", category: "Utility")]
+    public partial class RandomChanceCondition : Condition
+    {
+        [SerializeReference]
+        public BlackboardVariable<float> Chance = new BlackboardVariable<float>(50f);
+
+        public override bool IsTrue()
+        {
+            float roll = UnityEngine.Random.Range(0f, 100f);
+            return roll <= Chance.Value;
+        }
+    }
+}

Assets/Scripts/AI/BehaviorActions/Conditions/RandomChanceCondition.cs.meta

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+fileFormatVersion: 2
+guid: 3abe3d08ab4653b43a5a1708770fd3a1