E04a: /actuator/** 纳入网关自身端点旁路（探活不被 oapi 链裸 404）

projman 探活口径 = {ctx}/actuator/health 且只认 HTTP 200；网关原先只旁路
/api/internal/**，健康探针被 TargetRouter 判未知 target 裸 404 → HealthGuard
连续失败会周期性 restart，E05/E06 的 health=200 验收也不可能达成。
台账/验签/转发四处共用同一判定，故一处改动即全链生效。

src/test/java/com/yunhai/platform/gateway/chain/GatewayChainTest.java

@@ -179,4 +179,15 @@ class GatewayChainTest {
         ResponseEntity<String> resp = rest.postForEntity("/api/internal/routes/refresh", null, String.class);
         assertThat(resp.getStatusCodeValue()).as("自身端点走 controller，不进 oapi 链").isEqualTo(200);
     }
+
+    @Test
+    void actuator健康端点属自身端点_不被链拦且不入台账() throws Exception {
+        ResponseEntity<String> resp = rest.getForEntity("/actuator/health", String.class);
+
+        assertThat(resp.getStatusCodeValue()).as("健康探针不被 oapi 链裸 404（平台探活口径 = {ctx}/actuator/health）").isEqualTo(200);
+        assertThat(resp.getBody()).as("探针可读").contains("UP");
+
+        Thread.sleep(700);
+        assertThat(logRepository.findAll()).as("探针每 10s 一次，不得灌进 open_api 台账").isEmpty();
+    }
 }

src/test/java/com/yunhai/platform/gateway/chain/GatewayEnforceChainTest.java

@@ -128,4 +128,13 @@ class GatewayEnforceChainTest {
         assertThat(resp.getStatusCodeValue()).isEqualTo(200);
         assertThat(CALLER_SEEN.get()).isEqualTo("100617");
     }
+
+    @Test
+    void 收口形态下健康探针仍可达() {
+        ResponseEntity<String> resp = rest.getForEntity("/actuator/health", String.class);
+
+        assertThat(resp.getStatusCodeValue())
+                .as("observe=false 也不得拦自身探针：平台探活口径是 {ctx}/actuator/health，拦死即重启风暴")
+                .isEqualTo(200);
+    }
 }

src/test/resources/application-test.yml

@@ -12,3 +12,10 @@ spring:
   jpa:
     hibernate:
       ddl-auto: none
+
+management:
+  health:
+    redis:
+      # 测试上下文没有 redis（默认 localhost:6379 连不上会让聚合探针 503）；
+      # E04a 用例要钉的是「探针不经 oapi 链」= 平台探活口径 HTTP 200
+      enabled: false