Refresh rate is honoured exactly everywhere: no list floor, sampler up to 10 s, server caches reduced to coalescing only

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/prefs.ts

@@ -4,8 +4,8 @@ import { useEffect, useState } from 'react'
 
 export const REFRESH_OPTIONS = [250, 500, 1000, 2000, 5000] as const
 export const DEFAULT_REFRESH = 2000
-// Lists that shell out on the host (services, cron, updates, machines) never poll faster than this.
-export const LIST_FLOOR = 2000
+// No floors: the rate means exactly what it says on every page, at the host's expense.
+export const LIST_FLOOR = 0
 const KEY = 'hamlab.refresh'
 
 export function getRefreshMs(): number {