test: add integration tests for runtime management API

- EnvironmentAdminControllerIT: CRUD, access control, default env protection
- AppControllerIT: create, list, JAR upload, viewer access denied
- DeploymentControllerIT: deploy, list, not-found handling
- Fix bean name conflict: rename executor bean to deploymentTaskExecutor

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/RuntimeBeanConfig.java

@@ -63,7 +63,7 @@ public class RuntimeBeanConfig {
         return new DeploymentService(deployRepo, appService, envService);
     }
 
-    @Bean(name = "deploymentExecutor")
+    @Bean(name = "deploymentTaskExecutor")
     public Executor deploymentTaskExecutor() {
         ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
         executor.setCorePoolSize(4);

cameleer3-server-app/src/main/java/com/cameleer3/server/app/runtime/DeploymentExecutor.java

@@ -63,7 +63,7 @@ public class DeploymentExecutor {
         this.envService = envService;
     }
 
-    @Async("deploymentExecutor")
+    @Async("deploymentTaskExecutor")
     public void executeAsync(Deployment deployment) {
         try {
             // Stop existing deployment in same environment for same app