feat: Separate Gateway and Tool server architectures, implement Tool Auto-Registration, and add mock response mapping

src/main/java/io/shinhanlife/AxHubGatewayApplication.java

@@ -0,0 +1,22 @@
+package io.shinhanlife;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+import java.util.Collections;
+
+@SpringBootApplication
+@ComponentScan(basePackages = {
+    "io.shinhanlife.axhub.biz.mcp.gateway", 
+    "io.shinhanlife.axhub.biz.mcp.adapter", 
+    "io.shinhanlife.axhub.common.mcp"
+})
+public class AxHubGatewayApplication {
+    public static void main(String[] args) {
+        SpringApplication app = new SpringApplication(AxHubGatewayApplication.class);
+        // Gateway는 8081 포트에서 실행
+        app.setDefaultProperties(Collections.singletonMap("server.port", "8081"));
+        app.run(args);
+    }
+}

src/main/java/io/shinhanlife/AxHubToolApplication.java

@@ -0,0 +1,31 @@
+package io.shinhanlife;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+import java.util.Collections;
+
+@SpringBootApplication
+@EnableScheduling
+@ComponentScan(basePackages = {
+    "io.shinhanlife.axhub.biz.mcp.tool", 
+    "io.shinhanlife.axhub.biz.mcp.adapter", 
+    "io.shinhanlife.axhub.common.mcp"
+})
+public class AxHubToolApplication {
+    public static void main(String[] args) {
+        // 기본 포트는 8082로 설정하되, 파라미터(--server.port=808x)가 있으면 해당 포트로 설정
+        String port = "8082";
+        for (String arg : args) {
+            if (arg.startsWith("--server.port=")) {
+                port = arg.substring("--server.port=".length());
+            }
+        }
+        System.setProperty("server.port", port);
+        
+        SpringApplication app = new SpringApplication(AxHubToolApplication.class);
+        app.run(args);
+    }
+}

src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/controller/McpRouterController.java

@@ -153,7 +153,11 @@ public class McpRouterController {
 
     @PostMapping("/registry/heartbeat")
     public ResponseEntity<String> heartbeat(@RequestBody String toolName) {
-        redisRegistryService.refreshHeartbeat(toolName);
-        return ResponseEntity.ok("Heartbeat updated");
+        boolean success = redisRegistryService.refreshHeartbeat(toolName);
+        if (success) {
+            return ResponseEntity.ok("Heartbeat updated");
+        } else {
+            return ResponseEntity.status(404).body("Tool not found");
+        }
     }
 }

src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/registry/RedisRegistryService.java

@@ -34,13 +34,15 @@ public class RedisRegistryService {
     /**
      * 하트비트 갱신 (TTL 초기화)
      */
-    public void refreshHeartbeat(String toolName) {
+    public boolean refreshHeartbeat(String toolName) {
         String key = KEY_PREFIX + toolName;
         Boolean exists = redisTemplate.expire(key, DEFAULT_TTL);
         if (Boolean.TRUE.equals(exists)) {
             log.debug(" [RedisRegistry] 하트비트 갱신: {}", toolName);
+            return true;
         } else {
             log.warn(" [RedisRegistry] 존재하지 않는 툴에 대한 하트비트 요청: {}", toolName);
+            return false;
         }
     }
     public List<String> getAvailablePods(String toolName) {

src/main/java/io/shinhanlife/axhub/biz/mcp/tool/registry/MockToolAutoRegistrar.java

@@ -212,6 +212,7 @@ public class MockToolAutoRegistrar {
         HttpHeaders headers = createHeaders();
         headers.setContentType(MediaType.TEXT_PLAIN);
         
+        boolean needsReRegistration = false;
         for (ToolConfig tool : TOOLS) {
             try {
                 String heartbeatUrl = gatewayUrl + "/registry/heartbeat";
@@ -224,8 +225,14 @@ public class MockToolAutoRegistrar {
                 log.info(" [MockTool] {} Heartbeat 서버 전송 완료", tool.getName());
             } catch (Exception e) {
                 log.error(" [MockTool] {} Heartbeat 전송 실패: {}", tool.getName(), e.getMessage());
+                needsReRegistration = true;
             }
         }
+        
+        if (needsReRegistration) {
+            log.info(" [MockTool] 하트비트 실패로 인해 전체 툴 재등록을 시도합니다.");
+            registerOnStartup();
+        }
     }
 
     @EventListener(ContextClosedEvent.class)