feat: split Repairs into FM, Repair, and Custody workflows

The old Repairs module had grown ticketing-system features (status lifecycle,
comments, assignee, notes) that duplicate what the external ticketing tool
already owns. Vector only needs to track whether maintenance is open or closed.

- Rename RepairJob -> Fm (OPEN/CLOSED only), drop RepairComment, assignee, notes
- New Repair table: persistent log of physical part swaps, with ingest on
  unknown broken MPN via partModels.upsertByMpn
- New custody model: PENDING_DROP_IN_CUSTODY / PENDING_DESTRUCTION_IN_CUSTODY
  states + Part.custodianId, with a "My Custody" page for drop-off
- PartModel.destroyOnFail routes broken parts to the destruction path
- Host lookup on /fms and /repairs accepts hostId XOR assetId
- Wire the dormant webhook emitter: fm.opened, fm.closed, repair.logged
- Single fresh Prisma migration (dev DB was wiped, no backfill)

Tests: 60 passing (custody transitions in parts.test.ts; new fms.test.ts,
repairs.test.ts, custody.test.ts covering happy paths, validation failures,
webhook emissions, and ingest-on-unknown-MPN).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/App.tsx

@@ -13,8 +13,10 @@ import PartDetail from './pages/PartDetail.js';
 import Locations from './pages/Locations.js';
 import Manufacturers from './pages/Manufacturers.js';
 import PartModels from './pages/PartModels.js';
+import Fms from './pages/Fms.js';
+import FmDetail from './pages/FmDetail.js';
 import Repairs from './pages/Repairs.js';
-import RepairDetail from './pages/RepairDetail.js';
+import MyCustody from './pages/MyCustody.js';
 import Hosts from './pages/Hosts.js';
 import Users from './pages/admin/Users.js';
 import Webhooks from './pages/admin/Webhooks.js';
@@ -57,8 +59,10 @@ export default function App() {
                     <Route path="/locations" element={<Locations />} />
                     <Route path="/manufacturers" element={<Manufacturers />} />
                     <Route path="/part-models" element={<PartModels />} />
+                    <Route path="/fms" element={<Fms />} />
+                    <Route path="/fms/:id" element={<FmDetail />} />
                     <Route path="/repairs" element={<Repairs />} />
-                    <Route path="/repairs/:id" element={<RepairDetail />} />
+                    <Route path="/custody" element={<MyCustody />} />
                     <Route path="/hosts" element={<Hosts />} />
                     <Route
                       path="/admin/users"