feat: add requiresApproval flag to support HITL workflows

axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/annotation/McpFunction.java

@@ -19,4 +19,7 @@ public @interface McpFunction {
     
     // 추가: 툴 목록 노출 여부 제어 (false 시 라우팅은 되나 목록에서 숨김)
     boolean visible() default true;
+
+    // 추가: HITL 승인 체계 지원 (실행 전 사용자 승인 필요 여부)
+    boolean requiresApproval() default false;
 }

axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/dto/ToolMetadata.java

@@ -45,6 +45,9 @@ public class ToolMetadata {
     @Builder.Default
     private Boolean isRegistered = true;
 
+    @Builder.Default
+    private Boolean requiresApproval = false;
+
     public boolean isVisible() {
         return visible != null ? visible : true;
     }
@@ -57,4 +60,8 @@ public class ToolMetadata {
         this.isRegistered = isRegistered;
     }
 
+    public boolean isRequiresApproval() {
+        return requiresApproval != null ? requiresApproval : false;
+    }
+
 }

axhub-tool-core/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/service/ToolRegistryHeartbeatSender.java

@@ -101,6 +101,7 @@ public class ToolRegistryHeartbeatSender {
                     boolean isVisible = functionAnnotation.visible();
                     meta.setVisible(isVisible);
                     meta.setRegistered(isRegister);
+                    meta.setRequiresApproval(functionAnnotation.requiresApproval());
                     
                     Map<String, String> prompts = new HashMap<>();
                     String promptText = functionAnnotation.prompt();