feat: revamp web hub — global connection status, array config editor, log streaming

- Global connection badge in app header (persistent dashboard SSE via ConnectionProvider)
- LogProvider keeps log data and SSE stream alive across page switches (no reload spinner)
- Config drawer: password reveal toggle, array-type row editor for list fields
- Plugin management: optimistic updates, race-free loading, reset all group overrides
- Logs: load-earlier pagination; backend tail-read optimization (before/end offsets)
- web_auth: Web password changes persist (sync_admin seeding only when .env has explicit key)
- Dashboard: collect in thread pool + 1s result cache
- ErrorBoundary + local Suspense: plugin chunk loading stays inside content area
- UI polish: table row hover, mobile header/breadcrumb fixes, wider config drawer
- config_standard: array type inference for list fields; array env skip
- random_jm_code / steam_info: array schema migration; README web frontend note

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

hexi/web/src/lib/format.ts

@@ -0,0 +1,33 @@
+/** 通用格式化工具（首页/日志页等共用）。 */
+
+export function fmtBytes(n: number): string {
+  if (!Number.isFinite(n)) return '—'
+  const units = ['B', 'KB', 'MB', 'GB', 'TB']
+  let v = n
+  let i = 0
+  while (v >= 1024 && i < units.length - 1) { v /= 1024; i++ }
+  return v.toFixed(1) + ' ' + units[i]
+}
+
+export function fmtRate(n: number): string {
+  if (!Number.isFinite(n) || n < 0) return '0 B/s'
+  return fmtBytes(n) + '/s'
+}
+
+export function fmtUptime(sec: number): string {
+  if (!Number.isFinite(sec)) return '—'
+  const d = Math.floor(sec / 86400)
+  const h = Math.floor((sec % 86400) / 3600)
+  const m = Math.floor((sec % 3600) / 60)
+  const parts: string[] = []
+  if (d) parts.push(d + ' 天')
+  if (h) parts.push(h + ' 小时')
+  parts.push(m + ' 分')
+  return parts.join(' ')
+}
+
+export function fmtTime(ts?: string | number): string {
+  if (!ts) return '—'
+  const d = new Date(typeof ts === 'number' ? ts * 1000 : ts)
+  return isNaN(d.getTime()) ? String(ts) : d.toLocaleString('zh-CN', { hour12: false })
+}