Initial commit: Client Doc docs Server Tools

Co-authored-by: Cursor <cursoragent@cursor.com>

Server/Server.Host/Capabilities/ConsoleLogger.cs

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+using System;
+using XWorld.Framework;
+
+namespace XWorld.Server.Host
+{
+    public sealed class ConsoleLogger : ILogger
+    {
+        private readonly string _prefix;
+        public ConsoleLogger(string prefix = "") { _prefix = prefix; }
+        public void Info(string message)  => Console.WriteLine($"[INFO]{_prefix} {message}");
+        public void Warn(string message)  => Console.WriteLine($"[WARN]{_prefix} {message}");
+        public void Error(string message) => Console.WriteLine($"[ERROR]{_prefix} {message}");
+    }
+}

Server/Server.Host/Capabilities/InMemoryStorage.cs

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+using System.Collections.Generic;
+using XWorld.Framework;
+
+namespace XWorld.Server.Host
+{
+    public sealed class InMemoryStorage : IStorage
+    {
+        private readonly Dictionary<string, byte[]> _data = new Dictionary<string, byte[]>();
+        public byte[] Load(string key) => _data.TryGetValue(key, out var v) ? v : null;
+        public void Save(string key, byte[] data) => _data[key] = data;
+    }
+}

Server/Server.Host/Capabilities/ManualClock.cs

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+using XWorld.Framework;
+
+namespace XWorld.Server.Host
+{
+    // 手动推进的时钟；真实运行时改用墙钟实现（子项目 2b/后续）
+    public sealed class ManualClock : ITimer
+    {
+        public float Now { get; private set; }
+        public void Advance(float dt) { Now += dt; }
+    }
+}