Admin hub in /crush33: sidebar, donor lookup, danger-zone actions

Rebuilt the password-gated /crush33 (in-app /comp) screen into an admin
hub with a left sidebar and three sections:

- Comp tickets — the existing entry-only comp creator.
- Donor lookup — admin-only free-text search across the donor master
  list + online/offline transaction tables by name / email / phone /
  address / bear name (columns discovered per table, deduped by email).
- Actions (danger zone) — heavy warnings, red buttons, and an
  "are you sure" modal that spells out exactly what will happen:
    • Wipe slate — delete ALL ticket + audit records in the active
      event table (donor data untouched, irreversible).
    • Switch event table — repoint the app at a different NocoDB
      tickets/audit table to start a new event while keeping the old
      one intact.

Backend:
- New /api/admin/{status,wipe,switch-table,donor-search}, all gated by
  PORTAL_PASSWORD (POST-only so it never lands in a URL/log).
- NocoDBClient + AuditLogger: runtime-switchable tableId, count(),
  deleteAll(), probeTable() (reachable + Id-PK check before switching).
- DonorService.search() with adaptive column discovery.
- Table switch persists across redeploys via a small state file on a
  new /data volume (Dockerfile creates it owned by node so it's
  writable); applied at startup in buildContext.

Also shipped equivalent CLI scripts: scripts/wipe-slate.sh and
scripts/switch-event.sh. Drawer: "Comp tickets" -> "Admin (crush33)".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/components/SideMenu.tsx

@@ -7,8 +7,8 @@ import { theme } from "../lib/theme";
 const ITEMS: { label: string; icon: string; route: string; seg: string }[] = [
   { label: "Scanner", icon: "📷", route: "/", seg: "" },
   { label: "Event report", icon: "📊", route: "/stats", seg: "stats" },
-  { label: "Comp tickets", icon: "🎟️", route: "/comp", seg: "comp" },
-  { label: "Admin lookup", icon: "🔎", route: "/admin", seg: "admin" },
+  { label: "Admin (crush33)", icon: "🔐", route: "/comp", seg: "comp" },
+  { label: "Banquet lookup", icon: "🍽️", route: "/admin", seg: "admin" },
 ];
 
 export default function SideMenu({ visible, onClose }: { visible: boolean; onClose: () => void }) {