feat: add retry loop for tool registration at startup

dap-was-lib/src/main/java/io/shinhanlife/dap/lib/mcp/ToolRegistryHeartbeatSender.java

@@ -234,9 +234,11 @@ public class ToolRegistryHeartbeatSender {
     public void registerAllTools() {
         if (registeredTools.isEmpty()) return;
 
+        new Thread(() -> {
             for (ToolMetadata tool : registeredTools) {
                 registerTool(tool);
             }
+        }, "McpToolRegistrationThread").start();
     }
 
     @PreDestroy
@@ -259,17 +261,31 @@ public class ToolRegistryHeartbeatSender {
     }
 
     private void registerTool(ToolMetadata tool) {
+        int maxRetries = 12;
+        int delayMs = 10000;
+        for (int i = 0; i < maxRetries; i++) {
             try {
                 restClient.post()
                         .uri(gatewayUrl + "/mcp/api/v1/registry/register")
                         .header("Content-Type", "application/json")
-                    
                         .body(tool)
                         .retrieve()
                         .toBodilessEntity();
-            log.info(" [HeartbeatSender] 툴 재등록 성공: {}", tool.getUid());
+                log.info(" [HeartbeatSender] 툴 등록 성공: {}", tool.getUid());
+                return;
             } catch (Exception ex) {
-            log.error(" [HeartbeatSender] 툴 등록 실패: {}", ex.getMessage());
+                if (i == maxRetries - 1) {
+                    log.error(" [HeartbeatSender] 툴 등록 최종 실패 ({}회 재시도): {}", maxRetries, ex.getMessage());
+                } else {
+                    log.warn(" [HeartbeatSender] 툴 등록 실패, {}초 후 재시도... ({}/{}): {}", delayMs/1000, i+1, maxRetries, ex.getMessage());
+                    try {
+                        Thread.sleep(delayMs);
+                    } catch (InterruptedException ie) {
+                        Thread.currentThread().interrupt();
+                        break;
+                    }
+                }
+            }
         }
     }
 }