diff --git a/src/main/java/com/yunhai/flowcenter/service/FormCenterSchemaClient.java b/src/main/java/com/yunhai/flowcenter/service/FormCenterSchemaClient.java
index 2eacddd..faa1f5f 100644
--- a/src/main/java/com/yunhai/flowcenter/service/FormCenterSchemaClient.java
+++ b/src/main/java/com/yunhai/flowcenter/service/FormCenterSchemaClient.java
@@ -25,7 +25,7 @@ import java.util.Map;
 @Service
 public class FormCenterSchemaClient {
 
-    /** 服务目录 key（yh.open.services.form-center / targets 覆盖 / 枚举兜底三级解析） */
+    /** 服务目录 key（targets / services 覆盖优先，否则标准 appCode 网关 fallback） */
     static final String TARGET = "form-center";
     static final String SCHEMA_PATH = "/oapi/form/schema";
     /** 快照是发布期一次性动作，超时给足（对照 RouteJudgeClient 的 3s 运行期预算） */
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index dd60497..2b99408 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -74,7 +74,8 @@ yh:
     # 绝不能写进本文件：yh.open.services.{key} 是目录第 2 级，平台注入的 base-host 只喂第 3 级兜底、
     # 压不过它 —— 写进 jar 会让部署实例去连容器内的 localhost:8060（2026-09-18 事故：
     # Connection refused → 所有 /api/* 报 code=6 内部服务错误）。
-    base-host: http://localhost:8060
+    # 统一内部网关门地址；本地 UserBase 直连使用显式 services.userbase 覆盖。
+    base-host: ${YH_OPEN_BASE_HOST:http://open-gateway-service:10013}
     base-path: ""
     # 服务目录（子应用配置优化方案 §4.2）：只在需要覆盖 PlatformService 枚举默认 ctx 时按 key 配置；
     # prod 形态（网关域名 + 默认 ctx）下四域零配置。本地联调所需的 userbase 覆盖见上方环境变量。
diff --git a/src/test/java/com/yunhai/flowcenter/service/AppCodeFormCenterRoutingTest.java b/src/test/java/com/yunhai/flowcenter/service/AppCodeFormCenterRoutingTest.java
new file mode 100644
index 0000000..8aba0f9
--- /dev/null
+++ b/src/test/java/com/yunhai/flowcenter/service/AppCodeFormCenterRoutingTest.java
@@ -0,0 +1,41 @@
+package com.yunhai.flowcenter.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.sun.net.httpserver.HttpServer;
+import com.yunhai.platform.openapi.core.*;
+import org.junit.jupiter.api.Test;
+import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import static org.junit.jupiter.api.Assertions.*;
+
+class AppCodeFormCenterRoutingTest {
+    @Test
+    void realSdkNeedsOnlyGatewayForCatalogAndExactSchema() throws Exception {
+        List<String> paths = new ArrayList<>();
+        HttpServer gateway = HttpServer.create(new InetSocketAddress("127.0.0.1", 0), 0);
+        gateway.createContext("/", exchange -> {
+            String path = exchange.getRequestURI().getPath(); paths.add(path);
+            String data = path.endsWith("/schema")
+                    ? "{\"formUuid\":\"test-form\",\"version\":3,\"groups\":[],\"audience\":[]}"
+                    : "{\"items\":[],\"total\":0}";
+            byte[] bytes = ("{\"code\":0,\"data\":" + data + "}").getBytes(StandardCharsets.UTF_8);
+            exchange.sendResponseHeaders(200, bytes.length);
+            exchange.getResponseBody().write(bytes); exchange.close();
+        });
+        gateway.start();
+        try {
+            OpenApiProperties open = new OpenApiProperties();
+            open.setBaseHost("http://127.0.0.1:" + gateway.getAddress().getPort());
+            YschOpenCall call = new YschOpenCall(new YschCallProperties(), open, new ObjectMapper(), null);
+            assertFalse(call.hasTarget("form-center"));
+            assertEquals(0, new FormCenterCatalogClient(call).listForms(1L, null, null, 1, 20).getTotal());
+            assertEquals(3, new FormCenterSchemaClient(call, new ObjectMapper())
+                    .fetchSchema(1L, "test-form", 3).get("formVersion"));
+            assertEquals(java.util.Arrays.asList("/form-center/oapi/form/forms", "/form-center/oapi/form/schema"), paths);
+        } finally {
+            gateway.stop(0);
+        }
+    }
+}