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/pages/PartDetail.tsx

@@ -20,7 +20,6 @@ import { useAuth } from '../contexts/AuthContext.js';
 import { PartStateBadge } from '../components/parts/PartStateBadge.js';
 import { PartEventTimeline } from '../components/parts/PartEventTimeline.js';
 import { PartFormDialog } from '../components/parts/PartFormDialog.js';
-import { PartRepairSection } from '../components/parts/PartRepairSection.js';
 import { TagPicker } from '../components/tags/TagPicker.js';
 import { ConfirmDialog } from '../components/ConfirmDialog.js';
 
@@ -170,6 +169,8 @@ export default function PartDetail() {
                     <span className="font-mono text-xs">
                       {part.host.assetId} / {part.host.name}
                     </span>
+                  ) : part.custodian ? (
+                    <span className="text-xs">Custody: {part.custodian.username}</span>
                   ) : part.bin?.fullPath ? (
                     <span className="font-mono text-xs">{part.bin.fullPath}</span>
                   ) : (
@@ -223,8 +224,6 @@ export default function PartDetail() {
               <p className="mb-2 text-xs font-medium text-muted-foreground">Tags</p>
               <TagPicker partId={part.id} />
             </div>
-            <Separator className="my-3" />
-            <PartRepairSection partId={part.id} />
           </CardContent>
         </Card>