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/api/src/app.ts

@@ -22,7 +22,9 @@ import partRoutes from './routes/parts.js';
 import tagRoutes from './routes/tags.js';
 import categoryRoutes from './routes/categories.js';
 import hostRoutes from './routes/hosts.js';
+import fmRoutes from './routes/fms.js';
 import repairRoutes from './routes/repairs.js';
+import custodyRoutes from './routes/custody.js';
 import savedViewRoutes from './routes/saved-views.js';
 import analyticsRoutes from './routes/analytics.js';
 import webhookRoutes from './routes/webhooks.js';
@@ -88,7 +90,9 @@ app.use('/api/parts', partRoutes);
 app.use('/api/tags', tagRoutes);
 app.use('/api/categories', categoryRoutes);
 app.use('/api/hosts', hostRoutes);
+app.use('/api/fms', fmRoutes);
 app.use('/api/repairs', repairRoutes);
+app.use('/api/custody', custodyRoutes);
 app.use('/api/saved-views', savedViewRoutes);
 app.use('/api/analytics', analyticsRoutes);
 app.use('/api/admin/webhooks', webhookRoutes);