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.test.ts

@@ -3,50 +3,54 @@ import { BulkPartsRequest, CreatePartRequest, PartListQuery, UpdatePartRequest }
 
 const mfgId = '11111111-1111-4111-8111-111111111111';
 const binId = '22222222-2222-4222-8222-222222222222';
+const modelId = '44444444-4444-4444-8444-444444444444';
 
 describe('CreatePartRequest', () => {
-  it('accepts a minimal valid payload', () => {
+  it('accepts a partModelId-based payload', () => {
     const r = CreatePartRequest.parse({
       serialNumber: 'SN-1',
-      mpn: 'MPN-1',
-      manufacturerId: mfgId,
+      partModelId: modelId,
     });
     expect(r.serialNumber).toBe('SN-1');
   });
 
-  it('rejects empty serial / mpn', () => {
+  it('accepts a manufacturerId + mpn payload (auto-upsert path)', () => {
+    const r = CreatePartRequest.parse({
+      serialNumber: 'SN-1',
+      manufacturerId: mfgId,
+      mpn: 'MPN-1',
+    });
+    expect(r.mpn).toBe('MPN-1');
+  });
+
+  it('rejects when neither partModelId nor (manufacturerId + mpn) is provided', () => {
     expect(
-      CreatePartRequest.safeParse({ serialNumber: '', mpn: 'X', manufacturerId: mfgId }).success,
+      CreatePartRequest.safeParse({ serialNumber: 'SN-1', manufacturerId: mfgId }).success,
     ).toBe(false);
+    expect(CreatePartRequest.safeParse({ serialNumber: 'SN-1' }).success).toBe(false);
+  });
+
+  it('rejects empty serial', () => {
     expect(
-      CreatePartRequest.safeParse({ serialNumber: 'X', mpn: '', manufacturerId: mfgId }).success,
+      CreatePartRequest.safeParse({ serialNumber: '', partModelId: modelId }).success,
     ).toBe(false);
   });
 
   it('rejects negative price', () => {
     const res = CreatePartRequest.safeParse({
       serialNumber: 'X',
-      mpn: 'Y',
-      manufacturerId: mfgId,
+      partModelId: modelId,
       price: -1,
     });
     expect(res.success).toBe(false);
   });
 
-  it('rejects non-uuid manufacturer id', () => {
-    expect(
-      CreatePartRequest.safeParse({ serialNumber: 'X', mpn: 'Y', manufacturerId: 'not-uuid' })
-        .success,
-    ).toBe(false);
-  });
-
   it('caps tagIds at 32', () => {
     const tagIds = Array.from({ length: 33 }, () => '33333333-3333-4333-8333-333333333333');
     expect(
       CreatePartRequest.safeParse({
         serialNumber: 'X',
-        mpn: 'Y',
-        manufacturerId: mfgId,
+        partModelId: modelId,
         tagIds,
       }).success,
     ).toBe(false);
@@ -66,6 +70,11 @@ describe('UpdatePartRequest', () => {
     const r = UpdatePartRequest.parse({ binId: null });
     expect(r.binId).toBeNull();
   });
+
+  it('permits nullable hostId to clear host assignment', () => {
+    const r = UpdatePartRequest.parse({ hostId: null });
+    expect(r.hostId).toBeNull();
+  });
 });
 
 describe('PartListQuery', () => {
@@ -106,6 +115,11 @@ describe('BulkPartsRequest', () => {
     expect(r.binId).toBeNull();
   });
 
+  it('accepts hostId=null to unassign', () => {
+    const r = BulkPartsRequest.parse({ ids: [mfgId], hostId: null });
+    expect(r.hostId).toBeNull();
+  });
+
   it('caps ids at 500', () => {
     const ids = Array.from({ length: 501 }, () => binId);
     expect(BulkPartsRequest.safeParse({ ids, state: 'SPARE' }).success).toBe(false);