chore: initialize standalone UPM package

Runtime/Trigger/ShrinkTutorialAnchor.cs

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+using UnityEngine;
+
+namespace ShrinkTutorial
+{
+    public class ShrinkTutorialAnchor : MonoBehaviour
+    {
+        [SerializeField] private string anchorId = string.Empty;
+
+        public string AnchorId => anchorId;
+
+        public void SetAnchorId(string value)
+        {
+            anchorId = value ?? string.Empty;
+
+            if (isActiveAndEnabled)
+                ShrinkTutorialAnchorRegistry.Register(this);
+        }
+
+        private void OnEnable()
+        {
+            ShrinkTutorialAnchorRegistry.Register(this);
+        }
+
+        private void OnDisable()
+        {
+            ShrinkTutorialAnchorRegistry.Unregister(this);
+        }
+
+        private void OnValidate()
+        {
+            if (!Application.isPlaying)
+                return;
+
+            ShrinkTutorialAnchorRegistry.Register(this);
+        }
+    }
+}

Runtime/Trigger/ShrinkTutorialAnchor.cs.meta

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+MonoImporter:
+  externalObjects: {}
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+  assetBundleVariant: 

Runtime/Trigger/ShrinkTutorialAnchorRegistry.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace ShrinkTutorial
+{
+    public static class ShrinkTutorialAnchorRegistry
+    {
+        private static readonly Dictionary<string, ShrinkTutorialAnchor> Anchors = new();
+
+        public static void Register(ShrinkTutorialAnchor anchor)
+        {
+            if (!anchor || string.IsNullOrWhiteSpace(anchor.AnchorId))
+                return;
+
+            Anchors[anchor.AnchorId] = anchor;
+        }
+
+        public static void Unregister(ShrinkTutorialAnchor anchor)
+        {
+            if (!anchor || string.IsNullOrWhiteSpace(anchor.AnchorId))
+                return;
+
+            if (Anchors.TryGetValue(anchor.AnchorId, out var current) && current == anchor)
+                Anchors.Remove(anchor.AnchorId);
+        }
+
+        public static Transform Get(string anchorId)
+        {
+            if (string.IsNullOrWhiteSpace(anchorId))
+                return null;
+
+            return Anchors.TryGetValue(anchorId, out var anchor) && anchor
+                ? anchor.transform
+                : null;
+        }
+
+        public static void Reset()
+        {
+            Anchors.Clear();
+        }
+    }
+}

Runtime/Trigger/ShrinkTutorialAnchorRegistry.cs.meta

@@ -0,0 +1,11 @@
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Runtime/Trigger/ShrinkTutorialTrigger.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace ShrinkTutorial
+{
+    public class ShrinkTutorialTrigger : MonoBehaviour
+    {
+        private static readonly HashSet<string> FiredSessionKeys = new();
+
+        [SerializeField] private string tutorialId = string.Empty;
+        [SerializeField] private bool fireOnEnable = true;
+        [SerializeField] private bool onlyOncePerSession = true;
+        [SerializeField] private bool onlyIfNotCompleted = true;
+
+        private void OnEnable()
+        {
+            if (fireOnEnable)
+                Fire();
+        }
+
+        public void Fire()
+        {
+            if (string.IsNullOrWhiteSpace(tutorialId))
+                return;
+
+            var sessionKey = $"{gameObject.scene.path}:{gameObject.GetInstanceID()}:{tutorialId}";
+            if (onlyOncePerSession && !FiredSessionKeys.Add(sessionKey))
+                return;
+
+            var manager = ShrinkTutorialManager.Instance;
+            if (!manager)
+            {
+                Debug.LogWarning($"[ShrinkTutorial] 触发器 {name} 找不到 TutorialManager。");
+                return;
+            }
+
+            if (onlyIfNotCompleted && manager.HasCompleted(tutorialId))
+                return;
+
+            manager.StartTutorial(tutorialId);
+        }
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
+        private static void ResetSessionState()
+        {
+            FiredSessionKeys.Clear();
+        }
+    }
+}

Runtime/Trigger/ShrinkTutorialTrigger.cs.meta

@@ -0,0 +1,11 @@
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