feat: migrate UI to @cameleer/design-system, add backend endpoints

Backend:
- Add agent_events table (V5) and lifecycle event recording
- Add route catalog endpoint (GET /routes/catalog)
- Add route metrics endpoint (GET /routes/metrics)
- Add agent events endpoint (GET /agents/events-log)
- Enrich AgentInstanceResponse with tps, errorRate, activeRoutes, uptimeSeconds
- Add TimescaleDB retention/compression policies (V6)

Frontend:
- Replace custom Mission Control UI with @cameleer/design-system components
- Rebuild all pages: Dashboard, ExchangeDetail, RoutesMetrics, AgentHealth,
  AgentInstance, RBAC, AuditLog, OIDC, DatabaseAdmin, OpenSearchAdmin, Swagger
- New LayoutShell with design system AppShell, Sidebar, TopBar, CommandPalette
- Consume design system from Gitea npm registry (@cameleer/design-system@0.0.1)
- Add .npmrc for scoped registry, update Dockerfile with REGISTRY_TOKEN arg

CI:
- Pass REGISTRY_TOKEN build-arg to UI Docker build step

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

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

@@ -0,0 +1,12 @@
+package com.cameleer3.server.core.agent;
+
+import java.time.Instant;
+
+public record AgentEventRecord(
+        long id,
+        String agentId,
+        String appId,
+        String eventType,
+        String detail,
+        Instant timestamp
+) {}

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

@@ -0,0 +1,11 @@
+package com.cameleer3.server.core.agent;
+
+import java.time.Instant;
+import java.util.List;
+
+public interface AgentEventRepository {
+
+    void insert(String agentId, String appId, String eventType, String detail);
+
+    List<AgentEventRecord> query(String appId, String agentId, Instant from, Instant to, int limit);
+}

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

@@ -0,0 +1,27 @@
+package com.cameleer3.server.core.agent;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Instant;
+import java.util.List;
+
+public class AgentEventService {
+
+    private static final Logger log = LoggerFactory.getLogger(AgentEventService.class);
+
+    private final AgentEventRepository repository;
+
+    public AgentEventService(AgentEventRepository repository) {
+        this.repository = repository;
+    }
+
+    public void recordEvent(String agentId, String appId, String eventType, String detail) {
+        log.debug("Recording agent event: agent={}, app={}, type={}", agentId, appId, eventType);
+        repository.insert(agentId, appId, eventType, detail);
+    }
+
+    public List<AgentEventRecord> queryEvents(String appId, String agentId, Instant from, Instant to, int limit) {
+        return repository.query(appId, agentId, from, to, limit);
+    }
+}