新增原生工具调用数据结构与解析：SimpleAIClient.cs

AITool 增加 Schema 构造器与函数定义生成，所有工具补齐 GetParametersSchema()：AITool.cs 与 *.cs

Source/WulaFallenEmpire/EventSystem/AI/Tools/Tool_SetOverwatchMode.cs

@@ -11,6 +11,15 @@ namespace WulaFallenEmpire.EventSystem.AI.Tools
         public override string Name => "set_overwatch_mode";
         public override string Description => "Enables or disables the AI Overwatch Combat Protocol. When enabled (enabled=true), the AI will autonomously scan for hostile targets every few seconds and launch appropriate orbital bombardments for a set duration. When disabled (enabled=false), it immediately stops any active overwatch and clears the flight path. Use enabled=false to stop overwatch early if the player requests it.";
         public override string UsageSchema => "{\"enabled\":true,\"durationSeconds\":60}";
+        public override Dictionary<string, object> GetParametersSchema()
+        {
+            var properties = new Dictionary<string, object>
+            {
+                ["enabled"] = SchemaBoolean("Enable or disable overwatch.", nullable: true),
+                ["durationSeconds"] = SchemaInteger("Duration in seconds when enabling.", nullable: true)
+            };
+            return SchemaObject(properties, RequiredList("enabled", "durationSeconds"));
+        }
 
         public override string Execute(string args)
         {