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-app/src/main/java/com/cameleer3/server/app/dto/AgentEventResponse.java

@@ -0,0 +1,24 @@
+package com.cameleer3.server.app.dto;
+
+import com.cameleer3.server.core.agent.AgentEventRecord;
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+
+import java.time.Instant;
+
+@Schema(description = "Agent lifecycle event")
+public record AgentEventResponse(
+        @NotNull long id,
+        @NotNull String agentId,
+        @NotNull String appId,
+        @NotNull String eventType,
+        String detail,
+        @NotNull Instant timestamp
+) {
+    public static AgentEventResponse from(AgentEventRecord record) {
+        return new AgentEventResponse(
+                record.id(), record.agentId(), record.appId(),
+                record.eventType(), record.detail(), record.timestamp()
+        );
+    }
+}

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/AgentInstanceResponse.java

@@ -4,10 +4,11 @@ import com.cameleer3.server.core.agent.AgentInfo;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotNull;
 
+import java.time.Duration;
 import java.time.Instant;
 import java.util.List;
 
-@Schema(description = "Agent instance summary")
+@Schema(description = "Agent instance summary with runtime metrics")
 public record AgentInstanceResponse(
         @NotNull String id,
         @NotNull String name,
@@ -15,13 +16,29 @@ public record AgentInstanceResponse(
         @NotNull String status,
         @NotNull List<String> routeIds,
         @NotNull Instant registeredAt,
-        @NotNull Instant lastHeartbeat
+        @NotNull Instant lastHeartbeat,
+        double tps,
+        double errorRate,
+        int activeRoutes,
+        int totalRoutes,
+        long uptimeSeconds
 ) {
     public static AgentInstanceResponse from(AgentInfo info) {
+        long uptime = Duration.between(info.registeredAt(), Instant.now()).toSeconds();
         return new AgentInstanceResponse(
                 info.id(), info.name(), info.group(),
                 info.state().name(), info.routeIds(),
-                info.registeredAt(), info.lastHeartbeat()
+                info.registeredAt(), info.lastHeartbeat(),
+                0.0, 0.0,
+                0, info.routeIds() != null ? info.routeIds().size() : 0,
+                uptime
+        );
+    }
+
+    public AgentInstanceResponse withMetrics(double tps, double errorRate, int activeRoutes) {
+        return new AgentInstanceResponse(
+                id, name, group, status, routeIds, registeredAt, lastHeartbeat,
+                tps, errorRate, activeRoutes, totalRoutes, uptimeSeconds
         );
     }
 }

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/AgentSummary.java

@@ -0,0 +1,12 @@
+package com.cameleer3.server.app.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+
+@Schema(description = "Summary of an agent instance for sidebar display")
+public record AgentSummary(
+        @NotNull String id,
+        @NotNull String name,
+        @NotNull String status,
+        @NotNull double tps
+) {}

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/AppCatalogEntry.java

@@ -0,0 +1,16 @@
+package com.cameleer3.server.app.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+
+import java.util.List;
+
+@Schema(description = "Application catalog entry with routes and agents")
+public record AppCatalogEntry(
+        @NotNull String appId,
+        @NotNull List<RouteSummary> routes,
+        @NotNull List<AgentSummary> agents,
+        @NotNull int agentCount,
+        @NotNull String health,
+        @NotNull long exchangeCount
+) {}

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/RouteMetrics.java

@@ -0,0 +1,19 @@
+package com.cameleer3.server.app.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+
+import java.util.List;
+
+@Schema(description = "Aggregated route performance metrics")
+public record RouteMetrics(
+        @NotNull String routeId,
+        @NotNull String appId,
+        @NotNull long exchangeCount,
+        @NotNull double successRate,
+        @NotNull double avgDurationMs,
+        @NotNull double p99DurationMs,
+        @NotNull double errorRate,
+        @NotNull double throughputPerSec,
+        @NotNull List<Double> sparkline
+) {}

cameleer3-server-app/src/main/java/com/cameleer3/server/app/dto/RouteSummary.java

@@ -0,0 +1,13 @@
+package com.cameleer3.server.app.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+
+import java.time.Instant;
+
+@Schema(description = "Summary of a route within an application")
+public record RouteSummary(
+        @NotNull String routeId,
+        @NotNull long exchangeCount,
+        Instant lastSeen
+) {}