feat: rework EOL, repairs, and hosts for real workflow

Four domain-model changes driven by exercising the deployed 2.0 build:

- EOL moves from manufacturer to MPN via new PartModel catalog table,
  so alerts fire on the thing that actually ages.
- Repairs re-home to Host (required hostId + problem text) with an
  optional RepairJobPart join for affected parts; drop Part.replacementPartId.
- New /repairs/:id detail page with editable problem, part list, and
  a RepairComment thread (REPAIR_COMMENTED events fan out to each
  problem part's timeline).
- Host.assetId (required, unique) surfaces prominently on the repair
  page so techs can confirm they're touching the right box.

Single destructive migration reshapes existing dev data. All 7 packages
typecheck clean; 30 API tests pass (9 new covering host membership,
upsertByMpn idempotency + race, assetId 409, comment userId stamping).

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

packages/shared/src/parts.ts

@@ -2,31 +2,59 @@ import { z } from 'zod';
 import { PartState } from './enums.js';
 import { PaginationQuery } from './pagination.js';
 
-export const CreatePartRequest = z.object({
-  serialNumber: z.string().min(1).max(128),
-  mpn: z.string().min(1).max(128),
-  manufacturerId: z.string().uuid(),
-  price: z.number().nonnegative().optional().nullable(),
-  state: PartState.optional(),
-  binId: z.string().uuid().optional().nullable(),
-  notes: z.string().max(4096).optional().nullable(),
-  categoryId: z.string().uuid().optional().nullable(),
-  replacementPartId: z.string().uuid().optional().nullable(),
-  tagIds: z.array(z.string().uuid()).max(32).optional(),
-});
+// A part create/update can either reference an existing PartModel directly (partModelId)
+// or auto-provision one via manufacturerId + mpn. Exactly one form is required on create.
+const modelSelector = z
+  .object({
+    partModelId: z.string().uuid().optional(),
+    manufacturerId: z.string().uuid().optional(),
+    mpn: z.string().min(1).max(128).optional(),
+  })
+  .refine(
+    (v) => v.partModelId !== undefined || (v.manufacturerId !== undefined && v.mpn !== undefined),
+    { message: 'Provide partModelId or both manufacturerId and mpn' },
+  );
+
+export const CreatePartRequest = z
+  .object({
+    serialNumber: z.string().min(1).max(128),
+    partModelId: z.string().uuid().optional(),
+    manufacturerId: z.string().uuid().optional(),
+    mpn: z.string().min(1).max(128).optional(),
+    price: z.number().nonnegative().optional().nullable(),
+    state: PartState.optional(),
+    binId: z.string().uuid().optional().nullable(),
+    hostId: z.string().uuid().optional().nullable(),
+    notes: z.string().max(4096).optional().nullable(),
+    categoryId: z.string().uuid().optional().nullable(),
+    tagIds: z.array(z.string().uuid()).max(32).optional(),
+  })
+  .superRefine((v, ctx) => {
+    const parsed = modelSelector.safeParse({
+      partModelId: v.partModelId,
+      manufacturerId: v.manufacturerId,
+      mpn: v.mpn,
+    });
+    if (!parsed.success) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: 'Provide partModelId or both manufacturerId and mpn',
+        path: ['partModelId'],
+      });
+    }
+  });
 export type CreatePartRequest = z.infer<typeof CreatePartRequest>;
 
 export const UpdatePartRequest = z
   .object({
     serialNumber: z.string().min(1).max(128).optional(),
-    mpn: z.string().min(1).max(128).optional(),
-    manufacturerId: z.string().uuid().optional(),
+    partModelId: z.string().uuid().optional(),
     price: z.number().nonnegative().nullable().optional(),
     state: PartState.optional(),
     binId: z.string().uuid().nullable().optional(),
+    hostId: z.string().uuid().nullable().optional(),
     notes: z.string().max(4096).nullable().optional(),
     categoryId: z.string().uuid().nullable().optional(),
-    replacementPartId: z.string().uuid().nullable().optional(),
     tagIds: z.array(z.string().uuid()).max(32).optional(),
   })
   .refine((v) => Object.keys(v).length > 0, { message: 'At least one field required' });
@@ -36,6 +64,8 @@ export const PartListQuery = PaginationQuery.extend({
   state: PartState.optional(),
   binId: z.string().uuid().optional(),
   manufacturerId: z.string().uuid().optional(),
+  partModelId: z.string().uuid().optional(),
+  hostId: z.string().uuid().optional(),
   mpn: z.string().max(128).optional(),
   serialNumber: z.string().max(128).optional(),
   q: z.string().max(128).optional(),
@@ -56,6 +86,7 @@ export const BulkPartsRequest = z
     ids: z.array(z.string().uuid()).min(1).max(500),
     state: PartState.optional(),
     binId: z.string().uuid().nullable().optional(),
+    hostId: z.string().uuid().nullable().optional(),
     addTagIds: z.array(z.string().uuid()).max(32).optional(),
     removeTagIds: z.array(z.string().uuid()).max(32).optional(),
   })
@@ -63,6 +94,7 @@ export const BulkPartsRequest = z
     (v) =>
       v.state !== undefined ||
       v.binId !== undefined ||
+      v.hostId !== undefined ||
       (v.addTagIds && v.addTagIds.length > 0) ||
       (v.removeTagIds && v.removeTagIds.length > 0),
     { message: 'At least one mutation field is required' },