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_AnalyzeScreen.cs

@@ -15,6 +15,15 @@ namespace WulaFallenEmpire.EventSystem.AI.Tools
             "Analyze the current game screen screenshot. Provide an instruction to guide the analysis.";
 
         public override string UsageSchema => "{\"instruction\":\"Describe the current screen\"}";
+        public override Dictionary<string, object> GetParametersSchema()
+        {
+            var properties = new Dictionary<string, object>
+            {
+                ["instruction"] = SchemaString("Instruction for image analysis.", nullable: true),
+                ["context"] = SchemaString("Alias for instruction.", nullable: true)
+            };
+            return SchemaObject(properties, RequiredList("instruction", "context"));
+        }
 
         private const string BaseVisionSystemPrompt = "You are a seasoned RimWorld assistant. Analyze the screenshot per instruction. Keep replies concise. Do not output tool call JSON unless explicitly asked.";