core(deploy): add DeploymentConfigSnapshot record

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

cameleer-server-core/src/main/java/com/cameleer/server/core/runtime/DeploymentConfigSnapshot.java

@@ -0,0 +1,19 @@
+package com.cameleer.server.core.runtime;
+
+import com.cameleer.common.model.ApplicationConfig;
+
+import java.util.Map;
+
+/**
+ * Snapshot of the config that was deployed, captured at the moment a deployment
+ * transitions to RUNNING. Used for "last known good" restore (checkpoints) and
+ * for dirty-state detection on the deployment page.
+ *
+ * <p>This is persisted as JSONB in {@code deployments.deployed_config_snapshot}.</p>
+ */
+public record DeploymentConfigSnapshot(
+        String jarVersionId,
+        ApplicationConfig agentConfig,
+        Map<String, Object> containerConfig
+) {
+}