fix: use statsForApp when application is set without routeId

The stats endpoint was calling statsForRoute(null, agentIds) when
only application was set — this filtered by route_id=null, returning
zero results. Now correctly routes to statsForApp/timeseriesForApp
which queries the stats_1m_app continuous aggregate by application_name.

Also reverts the group parameter alias workaround — the deployed
backend correctly accepts 'application'.

Three code paths now:
- No filters → stats_1m_all (global)
- application only → stats_1m_app (per-app)
- routeId (±application) → stats_1m_route (per-route)

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/controller/SearchController.java

@@ -52,14 +52,12 @@ public class SearchController {
             @RequestParam(required = false) String agentId,
             @RequestParam(required = false) String processorType,
             @RequestParam(required = false) String application,
-            @RequestParam(required = false) String group,
             @RequestParam(defaultValue = "0") int offset,
             @RequestParam(defaultValue = "50") int limit,
             @RequestParam(required = false) String sortField,
             @RequestParam(required = false) String sortDir) {
 
-        String app = application != null ? application : group;
-        List<String> agentIds = resolveApplicationToAgentIds(app);
+        List<String> agentIds = resolveApplicationToAgentIds(application);
 
         SearchRequest request = new SearchRequest(
                 status, timeFrom, timeTo,
@@ -67,7 +65,7 @@ public class SearchController {
                 correlationId,
                 text, null, null, null,
                 routeId, agentId, processorType,
-                app, agentIds,
+                application, agentIds,
                 offset, limit,
                 sortField, sortDir
         );
@@ -94,13 +92,15 @@ public class SearchController {
             @RequestParam Instant from,
             @RequestParam(required = false) Instant to,
             @RequestParam(required = false) String routeId,
-            @RequestParam(required = false) String application,
-            @RequestParam(required = false) String group) {
+            @RequestParam(required = false) String application) {
         Instant end = to != null ? to : Instant.now();
-        List<String> agentIds = resolveApplicationToAgentIds(application != null ? application : group);
-        if (routeId == null && agentIds == null) {
+        if (routeId == null && application == null) {
             return ResponseEntity.ok(searchService.stats(from, end));
         }
+        if (routeId == null) {
+            return ResponseEntity.ok(searchService.statsForApp(from, end, application));
+        }
+        List<String> agentIds = resolveApplicationToAgentIds(application);
         return ResponseEntity.ok(searchService.stats(from, end, routeId, agentIds));
     }
 
@@ -111,10 +111,15 @@ public class SearchController {
             @RequestParam(required = false) Instant to,
             @RequestParam(defaultValue = "24") int buckets,
             @RequestParam(required = false) String routeId,
-            @RequestParam(required = false) String application,
-            @RequestParam(required = false) String group) {
+            @RequestParam(required = false) String application) {
         Instant end = to != null ? to : Instant.now();
-        List<String> agentIds = resolveApplicationToAgentIds(application != null ? application : group);
+        if (routeId == null && application == null) {
+            return ResponseEntity.ok(searchService.timeseries(from, end, buckets));
+        }
+        if (routeId == null) {
+            return ResponseEntity.ok(searchService.timeseriesForApp(from, end, buckets, application));
+        }
+        List<String> agentIds = resolveApplicationToAgentIds(application);
         if (routeId == null && agentIds == null) {
             return ResponseEntity.ok(searchService.timeseries(from, end, buckets));
         }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/search/SearchService.java

@@ -28,6 +28,10 @@ public class SearchService {
         return statsStore.stats(from, to);
     }
 
+    public ExecutionStats statsForApp(Instant from, Instant to, String applicationName) {
+        return statsStore.statsForApp(from, to, applicationName);
+    }
+
     public ExecutionStats stats(Instant from, Instant to, String routeId, List<String> agentIds) {
         return statsStore.statsForRoute(from, to, routeId, agentIds);
     }
@@ -36,6 +40,10 @@ public class SearchService {
         return statsStore.timeseries(from, to, bucketCount);
     }
 
+    public StatsTimeseries timeseriesForApp(Instant from, Instant to, int bucketCount, String applicationName) {
+        return statsStore.timeseriesForApp(from, to, bucketCount, applicationName);
+    }
+
     public StatsTimeseries timeseries(Instant from, Instant to, int bucketCount,
                                        String routeId, List<String> agentIds) {
         return statsStore.timeseriesForRoute(from, to, bucketCount, routeId, agentIds);