chore: initial Vector 2.0 monorepo

Ground-up TypeScript rewrite of the Vector hardware parts inventory
system. Ships the full roadmap (Phases 0-8) in one initial commit:

- pnpm + Turbo monorepo: apps/{api,web,e2e}, packages/{db,shared,ui,config}
- Express 5 + Prisma 5 + zod validation + JWT w/ refresh-token rotation
- React 19 + Vite + shadcn/ui + TanStack Query/Table + nuqs URL state
- Repair/RMA, tags, bulk ops, saved views, CSV audit export
- Analytics dashboard on Recharts + EOL tracking
- Signed webhook subscriptions (HMAC-SHA256) with in-process emitter
- Vitest unit tests (shared schemas, api services/helpers) + Playwright skeleton
- Gitea Actions CI (lint, typecheck, test+coverage, build) + Renovate

Deferred follow-ups: Postgres cutover (data-migration script ready),
BullMQ worker for webhook delivery, @react-pdf PDF export, CSV import wizard.

apps/web/src/pages/Locations.tsx

@@ -0,0 +1,42 @@
+import { parseAsString, useQueryState } from 'nuqs';
+import { PageHeader } from '../components/layout/PageHeader.js';
+import { SiteList } from '../components/locations/SiteList.js';
+import { RoomDrawer } from '../components/locations/RoomDrawer.js';
+import { BinGrid } from '../components/locations/BinGrid.js';
+import { useAuth } from '../contexts/AuthContext.js';
+
+export default function Locations() {
+  const { user } = useAuth();
+  const canEdit = user?.role === 'ADMIN';
+
+  const [siteId, setSiteId] = useQueryState('site', parseAsString);
+  const [roomId, setRoomId] = useQueryState('room', parseAsString);
+
+  const handleSite = (id: string) => {
+    void setSiteId(id || null);
+    void setRoomId(null);
+  };
+  const handleRoom = (id: string) => {
+    void setRoomId(id || null);
+  };
+
+  return (
+    <div className="flex h-[calc(100vh-var(--spacing-topbar,3.25rem)-3rem)] flex-col gap-4">
+      <PageHeader
+        title="Locations"
+        description="Sites → Rooms → Bins. Select a site to drill in."
+      />
+      <div className="grid min-h-0 flex-1 grid-cols-[16rem_16rem_1fr] overflow-hidden rounded-lg border border-border bg-card">
+        <div className="border-r border-border">
+          <SiteList selectedId={siteId} onSelect={handleSite} canEdit={canEdit} />
+        </div>
+        <div className="border-r border-border">
+          <RoomDrawer siteId={siteId} selectedId={roomId} onSelect={handleRoom} canEdit={canEdit} />
+        </div>
+        <div>
+          <BinGrid roomId={roomId} canEdit={canEdit} />
+        </div>
+      </div>
+    </div>
+  );
+}