Remove route key from initialize metadata

src/main/java/io/shinhanlife/dat/biz/mcp/method/InitializeHandler.java

@@ -8,7 +8,6 @@ import io.shinhanlife.dat.biz.mcp.context.McpRequestContext;
 import io.shinhanlife.dat.biz.mcp.jsonrpc.JsonRpcRequest;
 import io.shinhanlife.dat.biz.mcp.jsonrpc.JsonRpcResponse;
 import io.shinhanlife.dat.biz.mcp.registry.ToolRegistryClient;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -118,9 +117,6 @@ public class InitializeHandler implements McpMethodHandlerRegistry.Handler {
         }
         List<JsonNode> routingManifests =
                 registryClient.fetchRoutingManifests(routeKey, routingHintsProperties.manifestPath());
-        Map<String, Object> meta = new LinkedHashMap<>();
-        meta.put("routeKey", routeKey);
-        meta.put("toolServers", routingManifests);
-        return meta;
+        return Map.of("toolServers", routingManifests);
     }
 }

src/test/java/io/shinhanlife/dat/biz/mcp/method/InitializeHandlerTest.java

@@ -110,7 +110,7 @@ class InitializeHandlerTest {
         var response = handler.handle(request, io.shinhanlife.dat.biz.mcp.TestFixtures.context());
         var serialized = io.shinhanlife.dat.biz.mcp.TestFixtures.OBJECT_MAPPER.valueToTree(response.result());
 
-        assertThat(serialized.path("_meta").path("routeKey").asText()).isEqualTo("external");
+        assertThat(serialized.path("_meta").has("routeKey")).isFalse();
         assertThat(serialized.path("_meta").path("toolServers"))
                 .singleElement()
                 .isEqualTo(routingManifest);