feat: 클라이언트 유량제어/RequestProcessor custom 패키지로 분리

- DJBRequestProcessor: inbound.processor → custom.inbound.processor 이동
- ClientInflowTargetMetricService/Controller: custom.inflow 패키지 신규 생성
  클라이언트 메트릭 API(/manage/inflow/client/**)를 InflowTargetMetric*에서 분리
- InflowTargetMetricService/Controller: 클라이언트 관련 메서드/엔드포인트 제거
- InflowTargetBucketService: getClientDualManager() 분리 반영
- standard-message-config.properties: requestProcessor.class 경로 업데이트
- 단위 테스트: ClientInflowTargetMetric{Service,Controller}Test 추가,
  기존 테스트에서 클라이언트 케이스 분리

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/test/java/com/eactive/eai/manage/inflow/InflowTargetMetricServiceTest.java

@@ -13,12 +13,12 @@ import com.eactive.eai.common.inflow.dual.DualInflowControlManager;
 /**
  * InflowTargetMetricService 단위 테스트.
  *
- * <p>getDualManager()를 오버라이드하여 DualInflowControlManager 의존성을 주입한다.
+ * <p>어댑터/인터페이스 테스트는 getDualManager()를 오버라이드하여 DualInflowControlManager 주입.
  */
 class InflowTargetMetricServiceTest {
 
     // -------------------------------------------------------------------------
-    // 테스트용 서브클래스
+    // 테스트용 서브클래스 — 어댑터/인터페이스용
     // -------------------------------------------------------------------------
 
     private static InflowTargetMetricService serviceWith(DualInflowControlManager manager) {
@@ -76,11 +76,6 @@ class InflowTargetMetricServiceTest {
         assertNull(serviceWith(null).getInterfaceMetric("IF1"));
     }
 
-    @Test
-    void getClientMetric_managerIsNull_returnsNull() {
-        assertNull(serviceWith(null).getClientMetric("C1"));
-    }
-
     // =========================================================================
     // 어댑터 — 단일 조회
     // =========================================================================
@@ -271,55 +266,4 @@ class InflowTargetMetricServiceTest {
         serviceWith(manager).resetAllInterfaceMetrics();
         verify(manager).resetAllInterfaceMetrics();
     }
-
-    // =========================================================================
-    // 클라이언트 — 단일 조회
-    // =========================================================================
-
-    @Test
-    void getClientMetric_found_mapsFields() {
-        DualInflowControlManager manager = mock(DualInflowControlManager.class);
-        when(manager.getClientInflowThreshold("C1")).thenReturn(makeVO("C1"));
-        when(manager.getClientMetrics("C1")).thenReturn(makeMetrics(200, 30, 20));
-
-        TargetMetricDTO dto = serviceWith(manager).getClientMetric("C1");
-
-        assertNotNull(dto);
-        assertEquals("C1",     dto.getTargetId());
-        assertEquals("CLIENT", dto.getTargetType());
-        assertEquals(200, dto.getAllowed());
-        assertEquals(250, dto.getTotalRequests());
-    }
-
-    @Test
-    void getClientMetric_notRegistered_returnsNull() {
-        DualInflowControlManager manager = mock(DualInflowControlManager.class);
-        when(manager.getClientInflowThreshold("C1")).thenReturn(null);
-
-        assertNull(serviceWith(manager).getClientMetric("C1"));
-    }
-
-    @Test
-    void resetClientMetric_success_returnsTrueAndCallsManager() {
-        DualInflowControlManager manager = mock(DualInflowControlManager.class);
-        when(manager.getClientInflowThreshold("C1")).thenReturn(makeVO("C1"));
-
-        assertTrue(serviceWith(manager).resetClientMetric("C1"));
-        verify(manager).resetClientMetrics("C1");
-    }
-
-    @Test
-    void resetClientMetric_notRegistered_returnsFalse() {
-        DualInflowControlManager manager = mock(DualInflowControlManager.class);
-        when(manager.getClientInflowThreshold("C1")).thenReturn(null);
-
-        assertFalse(serviceWith(manager).resetClientMetric("C1"));
-    }
-
-    @Test
-    void resetAllClientMetrics_callsManager() {
-        DualInflowControlManager manager = mock(DualInflowControlManager.class);
-        serviceWith(manager).resetAllClientMetrics();
-        verify(manager).resetAllClientMetrics();
-    }
 }