fix(security): Set tool-server-api-key property and revert header name

dap-gateway/src/main/resources/application-local.yml

@@ -29,6 +29,7 @@ eims:
     url: http://localhost:${server.port}/api/mock/esb/string
 
 mcp:
+  tool-server-api-key: tool-server-key
   adapter:
     url: http://localhost:${server.port}/rpc/v1/execute
   gateway:

dap-gateway/src/main/resources/application.yml

@@ -28,6 +28,7 @@ report:
   service-url: ${REPORT_SERVICE_URL:http://tool-report:8092}
 
 mcp:
+  tool-server-api-key: tool-server-key
   gateway:
     fallback:
       default-url: http://was-cus:8084