feat: domain monitoring (merge plan M2, phase 1)

Port of the domain-intelligence pipeline from the old Beszel fork,
adapted to Dash's SQLite + no-PocketBase architecture:

- internal/domain: RDAP via IANA bootstrap (cached), TCP WHOIS :43
  fallback with multi-format parser, DNS (NS/MX/TXT/CNAME/A/AAAA),
  TLS leaf cert details, ip-api.com geolocation, provider detection
  (DNS/email/hosting/CA). HTML scraping, paid APIs, and exec-based
  whois deliberately dropped.
- API: domains CRUD + synchronous refresh + domain_checks snapshot
  history; refresh runs inside the monitor sweep on interval_h.
- UI: /domains + /domains/:id pages, add/edit dialog, domain board
  widget (favicon + expiry countdown), palette + nav entries,
  domainId picker in the widget dialog.
- Test seam: Server.lookup injects the refresh; domain tests run
  hermetic against a stubbed result.

Verified live: github.com resolves MarkMonitor expiry 2028-10,
Route 53 DNS, GitHub Pages hosting, Sectigo cert with 69d left.

Authored By: TDvorak <[email protected]>

Generated with Devin (https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/src/App.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 import { Link, Route, useLocation } from "wouter";
-import { Activity, LayoutGrid, Moon, Plus, Search, Settings, Sun } from "lucide-react";
+import { Activity, Globe, LayoutGrid, Moon, Plus, Search, Settings, Sun } from "lucide-react";
 import { BoardProvider, useBoard } from "@/board/store";
 import { Board } from "@/board/Board";
 import { ServiceDialog } from "@/components/ServiceDialog";
@@ -9,6 +9,8 @@ import { SettingsDialog } from "@/components/SettingsDialog";
 import { CommandPalette } from "@/components/CommandPalette";
 import { MonitorsPage } from "@/pages/MonitorsPage";
 import { MonitorDetailPage } from "@/pages/MonitorDetailPage";
+import { DomainsPage } from "@/pages/DomainsPage";
+import { DomainDetailPage } from "@/pages/DomainDetailPage";
 import { Button } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import type { Item } from "@/types";
@@ -24,6 +26,7 @@ export default function App() {
 const NAV = [
 	{ href: "/", label: "Board", icon: LayoutGrid },
 	{ href: "/monitors", label: "Monitors", icon: Activity },
+	{ href: "/domains", label: "Domains", icon: Globe },
 ];
 
 function Shell() {
@@ -132,6 +135,12 @@ function Shell() {
 			<Route path="/monitors/:id">
 				{(p) => <MonitorDetailPage id={p.id} />}
 			</Route>
+			<Route path="/domains">
+				<DomainsPage />
+			</Route>
+			<Route path="/domains/:id">
+				{(p) => <DomainDetailPage id={p.id} />}
+			</Route>
 
 			<ServiceDialog open={svcOpen} onOpenChange={setSvcOpen} item={editing?.kind === "service" ? editing : undefined} />
 			<WidgetDialog open={wdgOpen} onOpenChange={setWdgOpen} item={editing?.kind === "widget" ? editing : undefined} />