chore: initialize standalone UPM package

Editor/Scaffolding/ExternalModProjectTemplate/src/__PROJECT_NAME__Contracts.cs.txt

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+#nullable enable
+
+using ShrinkEventBus;
+using ShrinkNetwork;
+
+namespace __ROOT_NAMESPACE__
+{
+    public sealed class __PROJECT_NAME__Event : IShrinkEvent
+    {
+        public string Message { get; set; } = string.Empty;
+    }
+
+    [ShrinkNetworkMessage(__REQUEST_OPCODE__, "__ROUTE_PREFIX__/ping")]
+    public sealed class __PROJECT_NAME__PingRequest : IShrinkNetworkRequest
+    {
+        public string Message { get; set; } = string.Empty;
+    }
+
+    [ShrinkNetworkMessage(__RESPONSE_OPCODE__, "__ROUTE_PREFIX__/ping_response")]
+    public sealed class __PROJECT_NAME__PingResponse : ShrinkRpcResponseBase
+    {
+        public string Message { get; set; } = string.Empty;
+        public int Counter { get; set; }
+    }
+}

Editor/Scaffolding/ExternalModProjectTemplate/src/__PROJECT_NAME__Contracts.cs.txt.meta

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Editor/Scaffolding/ExternalModProjectTemplate/src/__PROJECT_NAME__Mod.cs.txt

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+#nullable enable
+
+using ShrinkCommand;
+using ShrinkEventBus;
+using ShrinkModFramework;
+using ShrinkNetwork;
+
+namespace __ROOT_NAMESPACE__
+{
+    [ShrinkMod("__MOD_ID__", "__DISPLAY_NAME__", "1.0.0")]
+    [ShrinkEventSubscriber(OwnerId = "__MOD_ID__", DefaultBus = "mod:__MOD_ID__")]
+    [ShrinkCommandSubscriber]
+    [ShrinkNetworkSubscriber]
+    public sealed partial class __PROJECT_NAME__Mod : ShrinkModBase
+    {
+        private readonly RuntimeState _state = new();
+
+        public override void OnConstruct(ShrinkModContext context)
+        {
+            context.Log("模组已构造。");
+        }
+
+        public override void OnRegisterContent(ShrinkModContext context)
+        {
+            context.RegisterContent("example.items", "example_item", "__DISPLAY_NAME__ Item");
+        }
+
+        public override void OnInitialize(ShrinkModContext context)
+        {
+            context.RegisterNetworkHandler<int>("sync.counter", (_, value) =>
+            {
+                _state.Counter = value;
+                context.Log("收到模组网络计数：" + value);
+            });
+        }
+
+        [ShrinkSubscribe]
+        private void OnExampleEvent(__PROJECT_NAME__Event evt)
+        {
+            _state.LastEventMessage = evt.Message ?? string.Empty;
+            _state.Counter++;
+        }
+
+        [ShrinkCommand("__COMMAND_ROOT__ ping", Description = "测试模组命令", Permission = "__MOD_ID__.command.ping")]
+        private string Ping()
+        {
+            return "pong:" + _state.Counter;
+        }
+
+        [ShrinkNetworkSubscribe(Permission = "__MOD_ID__.rpc.ping")]
+        private __PROJECT_NAME__PingResponse HandlePing(__PROJECT_NAME__PingRequest request)
+        {
+            return new __PROJECT_NAME__PingResponse
+            {
+                Message = "pong:" + (request.Message ?? string.Empty),
+                Counter = _state.Counter
+            };
+        }
+
+        private sealed class RuntimeState
+        {
+            public int Counter { get; set; }
+            public string LastEventMessage { get; set; } = string.Empty;
+        }
+    }
+}

Editor/Scaffolding/ExternalModProjectTemplate/src/__PROJECT_NAME__Mod.cs.txt.meta

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