fix: drop stale instance_id filter from search and scope route stats by app

The exchange search silently filtered by the in-memory agent registry's
current instance IDs on top of application_id. Historical exchanges written
by previous agent instances (or any instance not currently registered, e.g.
after a server restart before agents heartbeat back) were hidden from
results even though they matched the application filter.

Fix: drop the applicationId -> instanceIds resolution in SearchController.
Rely on application_id = ? in ClickHouseSearchIndex; keep explicit
instanceIds filtering only when a client passes them.

Related cleanup: the agentIds parameter on StatsStore.statsForRoute /
timeseriesForRoute was silently discarded inside ClickHouseStatsStore, so
per-route stats aggregated across any apps sharing a routeId. Replace with
String applicationId and add application_id to the stats_1m_route filters
so per-route stats are correctly scoped.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchRequest.java

@@ -22,8 +22,8 @@ import java.util.List;
  * @param routeId       exact match on route_id
  * @param instanceId    exact match on instance_id
  * @param processorType matches processor_types array via has()
- * @param applicationId application ID filter (resolved to instanceIds server-side)
- * @param instanceIds   list of instance IDs (resolved from application, used for IN clause)
+ * @param applicationId exact match on application_id
+ * @param instanceIds   list of instance IDs for an IN clause (only set when drilling down to specific agents)
  * @param offset        pagination offset (0-based)
  * @param limit         page size (default 50, max 500)
  * @param sortField     column to sort by (default: startTime)

cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchService.java

@@ -45,12 +45,12 @@ public class SearchService {
         return statsStore.statsForApp(from, to, applicationId, environment);
     }
 
-    public ExecutionStats stats(Instant from, Instant to, String routeId, List<String> agentIds) {
-        return statsStore.statsForRoute(from, to, routeId, agentIds, null);
+    public ExecutionStats statsForRoute(Instant from, Instant to, String routeId, String applicationId) {
+        return statsStore.statsForRoute(from, to, routeId, applicationId, null);
     }
 
-    public ExecutionStats stats(Instant from, Instant to, String routeId, List<String> agentIds, String environment) {
-        return statsStore.statsForRoute(from, to, routeId, agentIds, environment);
+    public ExecutionStats statsForRoute(Instant from, Instant to, String routeId, String applicationId, String environment) {
+        return statsStore.statsForRoute(from, to, routeId, applicationId, environment);
     }
 
     public StatsTimeseries timeseries(Instant from, Instant to, int bucketCount) {
@@ -69,14 +69,14 @@ public class SearchService {
         return statsStore.timeseriesForApp(from, to, bucketCount, applicationId, environment);
     }
 
-    public StatsTimeseries timeseries(Instant from, Instant to, int bucketCount,
-                                       String routeId, List<String> agentIds) {
-        return statsStore.timeseriesForRoute(from, to, bucketCount, routeId, agentIds, null);
+    public StatsTimeseries timeseriesForRoute(Instant from, Instant to, int bucketCount,
+                                       String routeId, String applicationId) {
+        return statsStore.timeseriesForRoute(from, to, bucketCount, routeId, applicationId, null);
     }
 
-    public StatsTimeseries timeseries(Instant from, Instant to, int bucketCount,
-                                       String routeId, List<String> agentIds, String environment) {
-        return statsStore.timeseriesForRoute(from, to, bucketCount, routeId, agentIds, environment);
+    public StatsTimeseries timeseriesForRoute(Instant from, Instant to, int bucketCount,
+                                       String routeId, String applicationId, String environment) {
+        return statsStore.timeseriesForRoute(from, to, bucketCount, routeId, applicationId, environment);
     }
 
     // ── Dashboard-specific queries ────────────────────────────────────────

cameleer-server-core/src/main/java/com/cameleer/server/core/storage/StatsStore.java

@@ -16,8 +16,8 @@ public interface StatsStore {
     // Per-app stats (stats_1m_app)
     ExecutionStats statsForApp(Instant from, Instant to, String applicationId, String environment);
 
-    // Per-route stats (stats_1m_route), optionally scoped to specific agents
-    ExecutionStats statsForRoute(Instant from, Instant to, String routeId, List<String> agentIds, String environment);
+    // Per-route stats (stats_1m_route), optionally scoped to an application
+    ExecutionStats statsForRoute(Instant from, Instant to, String routeId, String applicationId, String environment);
 
     // Per-processor stats (stats_1m_processor)
     ExecutionStats statsForProcessor(Instant from, Instant to, String routeId, String processorType);
@@ -28,9 +28,9 @@ public interface StatsStore {
     // Per-app timeseries
     StatsTimeseries timeseriesForApp(Instant from, Instant to, int bucketCount, String applicationId, String environment);
 
-    // Per-route timeseries, optionally scoped to specific agents
+    // Per-route timeseries, optionally scoped to an application
     StatsTimeseries timeseriesForRoute(Instant from, Instant to, int bucketCount,
-                                        String routeId, List<String> agentIds, String environment);
+                                        String routeId, String applicationId, String environment);
 
     // Per-processor timeseries
     StatsTimeseries timeseriesForProcessor(Instant from, Instant to, int bucketCount,