feat: rename logForwardingLevel to applicationLogLevel, add agentLogLevel

Align with cameleer3-common rename: logForwardingLevel → applicationLogLevel
(root logger) and new agentLogLevel (com.cameleer3 logger). Both fields
are on ApplicationConfig, pushed via config-update. UI shows "App Log Level"
and "Agent Log Level" on AppConfig slide-in, AgentHealth config bar, and
AppConfigDetailPage.

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

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

@@ -199,7 +199,8 @@ public class ApplicationConfigController {
         config.setMetricsEnabled(true);
         config.setSamplingRate(1.0);
         config.setTracedProcessors(Map.of());
-        config.setLogForwardingLevel("INFO");
+        config.setApplicationLogLevel("INFO");
+        config.setAgentLogLevel("INFO");
         config.setEngineLevel("REGULAR");
         config.setPayloadCaptureMode("NONE");
         return config;