feat: 어댑터/인터페이스/클라이언트 유량제어 메트릭 API 추가

InflowTargetMetricController / InflowTargetMetricService / TargetMetricDTO 추가.
어댑터·인터페이스·클라이언트별 허용/초당거절/임계거절 카운터 조회 및 초기화 API 제공.
단위테스트: InflowTargetMetricServiceTest(26건), InflowTargetMetricControllerTest(16건).

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

src/main/java/com/eactive/eai/manage/inflow/InflowTargetMetricController.java

@@ -0,0 +1,166 @@
+package com.eactive.eai.manage.inflow;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 어댑터/인터페이스/클라이언트 유량제어 메트릭 API.
+ *
+ * DualInflowControlManager 가 활성화된 환경에서만 정상 응답한다.
+ *
+ * GET  /manage/inflow/adapter/metric                      → 전체 어댑터 메트릭
+ * GET  /manage/inflow/adapter/{adapterId}/metric          → 특정 어댑터 메트릭
+ * POST /manage/inflow/adapter/metric/reset                → 전체 어댑터 메트릭 초기화
+ * POST /manage/inflow/adapter/{adapterId}/metric/reset    → 특정 어댑터 메트릭 초기화
+ *
+ * GET  /manage/inflow/interface/metric                    → 전체 인터페이스 메트릭
+ * GET  /manage/inflow/interface/{interfaceId}/metric      → 특정 인터페이스 메트릭
+ * POST /manage/inflow/interface/metric/reset              → 전체 인터페이스 메트릭 초기화
+ * POST /manage/inflow/interface/{interfaceId}/metric/reset → 특정 인터페이스 메트릭 초기화
+ *
+ * GET  /manage/inflow/client/metric                       → 전체 클라이언트 메트릭
+ * GET  /manage/inflow/client/{clientId}/metric            → 특정 클라이언트 메트릭
+ * POST /manage/inflow/client/metric/reset                 → 전체 클라이언트 메트릭 초기화
+ * POST /manage/inflow/client/{clientId}/metric/reset      → 특정 클라이언트 메트릭 초기화
+ */
+@RestController
+@RequestMapping("/manage/inflow")
+public class InflowTargetMetricController {
+
+    @Autowired
+    private InflowTargetMetricService metricService;
+
+    // =========================================================================
+    // 어댑터
+    // =========================================================================
+
+    @GetMapping("/adapter/metric")
+    public ResponseEntity<?> getAllAdapterMetrics() {
+        List<TargetMetricDTO> list = metricService.getAllAdapterMetrics();
+        return okList(list);
+    }
+
+    @GetMapping("/adapter/{adapterId}/metric")
+    public ResponseEntity<?> getAdapterMetric(@PathVariable String adapterId) {
+        TargetMetricDTO dto = metricService.getAdapterMetric(adapterId);
+        return okSingle(dto, "어댑터를 찾을 수 없습니다: " + adapterId);
+    }
+
+    @PostMapping("/adapter/metric/reset")
+    public ResponseEntity<?> resetAllAdapterMetrics() {
+        metricService.resetAllAdapterMetrics();
+        return okReset("전체 어댑터 메트릭 초기화 완료");
+    }
+
+    @PostMapping("/adapter/{adapterId}/metric/reset")
+    public ResponseEntity<?> resetAdapterMetric(@PathVariable String adapterId) {
+        boolean ok = metricService.resetAdapterMetric(adapterId);
+        return okResetSingle(ok, adapterId, "어댑터");
+    }
+
+    // =========================================================================
+    // 인터페이스
+    // =========================================================================
+
+    @GetMapping("/interface/metric")
+    public ResponseEntity<?> getAllInterfaceMetrics() {
+        List<TargetMetricDTO> list = metricService.getAllInterfaceMetrics();
+        return okList(list);
+    }
+
+    @GetMapping("/interface/{interfaceId}/metric")
+    public ResponseEntity<?> getInterfaceMetric(@PathVariable String interfaceId) {
+        TargetMetricDTO dto = metricService.getInterfaceMetric(interfaceId);
+        return okSingle(dto, "인터페이스를 찾을 수 없습니다: " + interfaceId);
+    }
+
+    @PostMapping("/interface/metric/reset")
+    public ResponseEntity<?> resetAllInterfaceMetrics() {
+        metricService.resetAllInterfaceMetrics();
+        return okReset("전체 인터페이스 메트릭 초기화 완료");
+    }
+
+    @PostMapping("/interface/{interfaceId}/metric/reset")
+    public ResponseEntity<?> resetInterfaceMetric(@PathVariable String interfaceId) {
+        boolean ok = metricService.resetInterfaceMetric(interfaceId);
+        return okResetSingle(ok, interfaceId, "인터페이스");
+    }
+
+    // =========================================================================
+    // 클라이언트
+    // =========================================================================
+
+    @GetMapping("/client/metric")
+    public ResponseEntity<?> getAllClientMetrics() {
+        List<TargetMetricDTO> list = metricService.getAllClientMetrics();
+        return okList(list);
+    }
+
+    @GetMapping("/client/{clientId}/metric")
+    public ResponseEntity<?> getClientMetric(@PathVariable String clientId) {
+        TargetMetricDTO dto = metricService.getClientMetric(clientId);
+        return okSingle(dto, "클라이언트를 찾을 수 없습니다: " + clientId);
+    }
+
+    @PostMapping("/client/metric/reset")
+    public ResponseEntity<?> resetAllClientMetrics() {
+        metricService.resetAllClientMetrics();
+        return okReset("전체 클라이언트 메트릭 초기화 완료");
+    }
+
+    @PostMapping("/client/{clientId}/metric/reset")
+    public ResponseEntity<?> resetClientMetric(@PathVariable String clientId) {
+        boolean ok = metricService.resetClientMetric(clientId);
+        return okResetSingle(ok, clientId, "클라이언트");
+    }
+
+    // =========================================================================
+    // Helpers
+    // =========================================================================
+
+    private ResponseEntity<?> okList(List<TargetMetricDTO> list) {
+        Map<String, Object> result = new HashMap<>();
+        result.put("success", true);
+        result.put("data", list);
+        result.put("count", list.size());
+        return ResponseEntity.ok(result);
+    }
+
+    private ResponseEntity<?> okSingle(TargetMetricDTO dto, String notFoundMsg) {
+        if (dto == null) {
+            Map<String, Object> error = new HashMap<>();
+            error.put("success", false);
+            error.put("message", notFoundMsg);
+            return ResponseEntity.ok(error);
+        }
+        Map<String, Object> result = new HashMap<>();
+        result.put("success", true);
+        result.put("data", dto);
+        return ResponseEntity.ok(result);
+    }
+
+    private ResponseEntity<?> okReset(String message) {
+        Map<String, Object> result = new HashMap<>();
+        result.put("success", true);
+        result.put("message", message);
+        return ResponseEntity.ok(result);
+    }
+
+    private ResponseEntity<?> okResetSingle(boolean ok, String targetId, String targetLabel) {
+        Map<String, Object> result = new HashMap<>();
+        result.put("success", ok);
+        result.put("message", ok
+            ? "초기화 완료: " + targetId
+            : targetLabel + "를 찾을 수 없습니다: " + targetId);
+        return ResponseEntity.ok(result);
+    }
+}