feat(#119): expose route state in catalog API and sidebar/dashboard

Add routeState field to RouteSummary DTO (null for started, 'stopped'
or 'suspended' for non-default states). Sidebar shows stop/pause icons
and state badge for affected routes in both Apps and Routes sections.

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/RouteSummary.java

@@ -11,5 +11,8 @@ public record RouteSummary(
         @NotNull long exchangeCount,
         Instant lastSeen,
         @Schema(description = "The from() endpoint URI, e.g. 'direct:processOrder'")
-        String fromEndpointUri
+        String fromEndpointUri,
+        @Schema(description = "Operational state of the route: stopped, suspended, or null (started/default)")
+        String routeState
 ) {}
+