fix: Runtime tab respects selected environment

- Add environment parameter to AgentEventsController, AgentEventService,
  and ClickHouseAgentEventRepository (filters agent_events by environment)
- Wire selectedEnv to useAgents and useAgentEvents in both AgentHealth
  and AgentInstance pages
- Wire selectedEnv to useStatsTimeseries in AgentInstance

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

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

@@ -8,4 +8,6 @@ public interface AgentEventRepository {
     void insert(String instanceId, String applicationId, String eventType, String detail);
 
     List<AgentEventRecord> query(String applicationId, String instanceId, Instant from, Instant to, int limit);
+
+    List<AgentEventRecord> query(String applicationId, String instanceId, String environment, Instant from, Instant to, int limit);
 }

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

@@ -24,4 +24,8 @@ public class AgentEventService {
     public List<AgentEventRecord> queryEvents(String applicationId, String instanceId, Instant from, Instant to, int limit) {
         return repository.query(applicationId, instanceId, from, to, limit);
     }
+
+    public List<AgentEventRecord> queryEvents(String applicationId, String instanceId, String environment, Instant from, Instant to, int limit) {
+        return repository.query(applicationId, instanceId, environment, from, to, limit);
+    }
 }