feat(admin): add LLM call logs, system info, plugin list pages

- ai-core/llm: ring-buffer call logger with stats
- Gateway: /api/v1/admin/llm-calls, /system, /plugins, /sessions endpoints
- Frontend: LLMCallsPage (table + stats), SystemPage (version/plugins/sessions)
- Admin nav expanded to 7 items

backend/cmd/cyrene/main.go

@@ -32,6 +32,7 @@ import (
 	websearch "git.yeij.top/AskaEth/Cyrene_v2/plugins/web-search"
 
 	"git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/llm"
+	llmlog "git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/llm"
 	aiCoreCtx "git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/context"
 	"git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/orchestrator"
 	"git.yeij.top/AskaEth/Cyrene_v2/services/ai-core/persona"
@@ -231,9 +232,12 @@ func main() {
 	authMgr := api.NewRealAuthManager(cfg.JWTSecret, cfg.JWTExpiryHours, userStore)
 
 	// Build dependencies for gateway handlers
+	llmLogger := llmlog.NewLogger(200)
 	gwDeps := api.Dependencies{
 		AuthMgr:      authMgr,
 		Orchestrator: orch,
+		LLMLogger:    &llmLoggerAdapter{Logger: llmLogger},
+		PluginList:   pluginNamesToMap(reg.ListNames()),
 	}
 	if memSvc != nil {
 		gwDeps.MemorySvc = memory.NewAPIAdapter(memSvc)
@@ -276,4 +280,16 @@ func main() {
 	_ = voiceSvc
 	_ = memSvc
 	_ = orch
-}
+}
+// llmLoggerAdapter adapts llm.Logger to api.LLMCallLogger interface.
+type llmLoggerAdapter struct{ *llmlog.Logger }
+
+func (a *llmLoggerAdapter) Recent(n int) []map[string]any { return a.Logger.RecentMaps(n) }
+
+func pluginNamesToMap(names []string) []map[string]string {
+	result := make([]map[string]string, len(names))
+	for i, n := range names {
+		result[i] = map[string]string{"name": n, "enabled": "true"}
+	}
+	return result
+}