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>

packages/shared/src/fms.ts

@@ -0,0 +1,52 @@
+import { z } from 'zod';
+import { FmStatus } from './enums.js';
+import { PaginationQuery } from './pagination.js';
+
+// Host lookup accepts either a uuid `hostId` or a string `assetId` — exactly one.
+const hostSelector = {
+  hostId: z.string().uuid().optional(),
+  assetId: z.string().trim().min(1).max(128).optional(),
+};
+
+function hostSelectorRefine<T extends { hostId?: string; assetId?: string }>(
+  v: T,
+  ctx: z.RefinementCtx,
+) {
+  const has = [v.hostId, v.assetId].filter((x) => x !== undefined && x !== '').length;
+  if (has !== 1) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: 'Provide exactly one of hostId or assetId',
+      path: ['hostId'],
+    });
+  }
+}
+
+export const CreateFmRequest = z
+  .object({
+    ...hostSelector,
+    problem: z.string().trim().min(1, 'Problem is required').max(2000),
+    problemPartIds: z.array(z.string().uuid()).max(100).optional(),
+  })
+  .superRefine(hostSelectorRefine);
+export type CreateFmRequest = z.infer<typeof CreateFmRequest>;
+
+export const UpdateFmRequest = z
+  .object({
+    status: FmStatus.optional(),
+    problem: z.string().trim().min(1).max(2000).optional(),
+    problemPartIds: z.array(z.string().uuid()).max(100).optional(),
+  })
+  .refine((v) => Object.keys(v).length > 0, { message: 'At least one field required' });
+export type UpdateFmRequest = z.infer<typeof UpdateFmRequest>;
+
+export const FmListQuery = PaginationQuery.extend({
+  status: FmStatus.optional(),
+  hostId: z.string().uuid().optional(),
+  problemPartId: z.string().uuid().optional(),
+  openOnly: z
+    .union([z.literal('true'), z.literal('false'), z.boolean()])
+    .transform((v) => v === true || v === 'true')
+    .optional(),
+});
+export type FmListQuery = z.infer<typeof FmListQuery>;