feat(ui,api,admin): sveltekit admin spa, usage by day/agent/conversation/model, rate limits, memory tree, turn snapshot

ui/src/lib/limits.ts

@@ -0,0 +1,11 @@
+export const LIMIT_LABELS: Record<string, string> = {
+  five_hour: "5-hour",
+  overage: "overage",
+  seven_day: "7-day",
+  seven_day_opus: "7-day · Opus",
+  seven_day_sonnet: "7-day · Sonnet",
+};
+
+export function limitLabel(window: string): string {
+  return LIMIT_LABELS[window] ?? window;
+}