Add activity logs, sidebar badges, and logout with working alert colors.

Record auth audits and surface them in Activity, poll sidebar counts without resetting idle, and add a profile logout path plus theme red/green/blue tokens so failure badges render.

service/internal/api/router.go

@@ -56,6 +56,7 @@ func NewRouter(configDir string) http.Handler {
 	mux.HandleFunc("DELETE /api/v1/nodes/{id}", app.nodesDeleteHandler)
 	mux.HandleFunc("POST /api/v1/nodes/{id}/test-ssh", app.nodesTestSSHHandler)
 	mux.HandleFunc("GET /api/v1/node-logs", app.nodeLogsListHandler)
+	mux.HandleFunc("GET /api/v1/auth-logs", app.authLogsListHandler)
 
 	return app.withCORS(app.withMiddleware(mux))
 }