feat(activity): one Activity page — runs, admin actions, server log and quota under one filter bar

The audit log, the server log and the admin quota view were three pages (the quota one a Stats tab),
each with its own filters, and the background runs had no list at all. Now one page ("Napló" /
"Activity") reads all four, each still its own table on the server: a shared bar (text, a period of
1 h to 90 days defaulting to 7, an account) and each tab's own filters, the whole view in the URL.
The old page ids open their tab.

Server side: the audit log and the new run list (`/api/admin/runs`) filter and page like the server
log, through one keyset helper (`routes/_keyset`) the log now shares; an audit row keeps the request
it was made in (migration 0111), so its log lines are a pivot away, as a run's are (`lrun`). The
quota breakdown takes since/until and one account. The Scheduler rows get a history button to their
job's runs.

Also fixed on the way: re-saving the value in force on the Configuration page staged its override
without committing it (the commit sat inside the audit branch), so the save was lost.

frontend/e2e/a11y.spec.ts

@@ -31,7 +31,7 @@ async function violations(page: Page): Promise<string[]> {
 
 test.describe("accessibility (axe)", () => {
   const RAIL = ["feed", "channels", "playlists", "files", "stats", "settings"];
-  const ADMIN = ["scheduler", "config", "users", "audit"];
+  const ADMIN = ["scheduler", "config", "users", "activity"];
 
   for (const id of RAIL) {
     test(`page: ${id}`, async ({ page }) => {