feat: add metrics, observability, test fixtures, and scaling playbook artifacts

frontend/src/admin.ts

@@ -172,7 +172,7 @@ async function switchTab(tabName: string) {
   if (tabName === "system") refreshSystemSummary();
 }
 
-async function refreshOverview() {
+export async function refreshOverview() {
   try {
     const response = await fetch("/api/admin/overview");
     if (!response.ok) throw new Error(`HTTP ${response.status}`);
@@ -198,7 +198,7 @@ async function refreshOverview() {
   }
 }
 
-async function refreshAnalytics() {
+export async function refreshAnalytics() {
   setStatus("analytics-status", "Loading analytics...");
   try {
     const response = await fetch("/api/admin/analytics");
@@ -255,7 +255,7 @@ async function refreshPlaylist() {
   }
 }
 
-function renderPlaylistSortable(content: string) {
+export function renderPlaylistSortable(content: string) {
   const list = document.getElementById("playlist-sortable");
   if (!list) return;
   const lines = content.split("\n").filter((l) => l.trim() && !l.startsWith("#"));
@@ -352,7 +352,7 @@ async function showPlaylistWarnings(content: string) {
   }
 }
 
-async function savePlaylist() {
+export async function savePlaylist() {
   if (state.playlistSaving) return;
   state.playlistSaving = true;
   setStatus("playlist-status", "Saving playlist...");