fix: move status filtering server-side in Dashboard search

The Dashboard was fetching 50 results without a status filter and
filtering client-side, causing fewer matches when filtering by error
compared to route-specific pages that filter server-side. Now passes
statusFilters to the OpenSearch query. Backend supports comma-separated
status values for multi-select filters.

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/search/OpenSearchIndex.java

@@ -179,8 +179,20 @@ public class OpenSearchIndex implements SearchIndex {
         }
 
         // Keyword filters (use .keyword sub-field for exact matching on dynamically mapped text fields)
-        if (request.status() != null)
-            filter.add(termQuery("status.keyword", request.status()));
+        if (request.status() != null && !request.status().isBlank()) {
+            String[] statuses = request.status().split(",");
+            if (statuses.length == 1) {
+                filter.add(termQuery("status.keyword", statuses[0].trim()));
+            } else {
+                filter.add(Query.of(q -> q.terms(t -> t
+                        .field("status.keyword")
+                        .terms(tv -> tv.value(
+                                java.util.Arrays.stream(statuses)
+                                        .map(String::trim)
+                                        .map(FieldValue::of)
+                                        .toList())))));
+            }
+        }
         if (request.routeId() != null)
             filter.add(termQuery("route_id.keyword", request.routeId()));
         if (request.agentId() != null)