feat(core): expand DeploymentStatus and add DeployStage enum

Adds DEGRADED and STOPPING to DeploymentStatus (reordered for lifecycle
clarity). Introduces DeployStage enum for tracking orchestration progress
through PRE_FLIGHT → COMPLETE.

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/DeployStage.java

@@ -0,0 +1,5 @@
+package com.cameleer3.server.core.runtime;
+
+public enum DeployStage {
+    PRE_FLIGHT, PULL_IMAGE, CREATE_NETWORK, START_REPLICAS, HEALTH_CHECK, SWAP_TRAFFIC, COMPLETE
+}

cameleer3-server-core/src/main/java/com/cameleer3/server/core/runtime/DeploymentStatus.java

@@ -1,3 +1,5 @@
 package com.cameleer3.server.core.runtime;
 
-public enum DeploymentStatus { STARTING, RUNNING, FAILED, STOPPED }
+public enum DeploymentStatus {
+    STOPPED, STARTING, RUNNING, DEGRADED, STOPPING, FAILED
+}