feat(#119): add RouteStateRegistry for tracking route operational state

In-memory registry that infers route state (started/stopped/suspended)
from successful route-control command ACKs. Updates state only when all
agents in a group confirm success.

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

cameleer3-server-core/src/main/java/com/cameleer3/server/core/agent/RouteStateRegistry.java

@@ -0,0 +1,36 @@
+package com.cameleer3.server.core.agent;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * In-memory registry tracking the operational state of routes.
+ * State is inferred from successful route-control command ACKs.
+ * On server restart, all states reset to STARTED (default Camel behavior).
+ */
+public class RouteStateRegistry {
+
+    public enum RouteState { STARTED, STOPPED, SUSPENDED }
+
+    // Key: "applicationId:routeId"
+    private final ConcurrentHashMap<String, RouteState> states = new ConcurrentHashMap<>();
+
+    public void setState(String applicationId, String routeId, RouteState state) {
+        states.put(applicationId + ":" + routeId, state);
+    }
+
+    public RouteState getState(String applicationId, String routeId) {
+        return states.getOrDefault(applicationId + ":" + routeId, RouteState.STARTED);
+    }
+
+    public Map<String, RouteState> getStatesForApplication(String applicationId) {
+        Map<String, RouteState> result = new LinkedHashMap<>();
+        states.forEach((key, state) -> {
+            if (key.startsWith(applicationId + ":")) {
+                result.put(key.substring(applicationId.length() + 1), state);
+            }
+        });
+        return result;
+    }
+}