Add advanced container stats tab with timeframes and I/O charts.

Expand server history samples with network/block rates and longer
retention, and rebuild the details Stats tab with live KPIs, 1m–30m
windows, auto-scale, pause, CSV export, and CPU/memory/net/disk charts.

test/stats-history.test.js

@@ -4,6 +4,7 @@ import {
   getHistory,
   pruneMissing,
   clearHistory,
+  maxHistoryPoints,
 } from '../server/services/stats-history.js'
 
 test('stats history ring buffer', (t) => {
@@ -18,3 +19,40 @@ test('stats history ring buffer', (t) => {
   pruneMissing([])
   t.is(getHistory(id).length, 0)
 })
+
+test('stats history stores io rates and supports since filter', (t) => {
+  clearHistory()
+  const id = 'io1'
+  const t0 = Date.now() - 10_000
+  // inject samples with forced timestamps via direct map is not exported;
+  // recordSample uses Date.now() — filter by since slightly in the past
+  recordSample(id, {
+    cpu: 1,
+    memory: 100,
+    memoryLimit: 1000,
+    netRxRate: 10,
+    netTxRate: 20,
+    blkReadRate: 30,
+    blkWriteRate: 40,
+  })
+  recordSample(id, {
+    cpu: 2,
+    memory: 200,
+    netRxRate: 11,
+    netTxRate: 21,
+    blkReadRate: 31,
+    blkWriteRate: 41,
+  })
+  const all = getHistory(id)
+  t.is(all.length, 2)
+  t.is(all[0].netRxRate, 10)
+  t.is(all[1].blkWriteRate, 41)
+  t.ok(all[0].memoryLimit === 1000 || all[0].memoryLimit === 0)
+
+  const future = getHistory(id, { since: Date.now() + 60_000 })
+  t.is(future.length, 0)
+
+  const recent = getHistory(id, { since: t0 })
+  t.is(recent.length, 2)
+  t.ok(maxHistoryPoints() >= 120)
+})