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>

apps/web/src/lib/queryKeys.ts

@@ -47,12 +47,20 @@ export const queryKeys = {
     list: (filters?: Record<string, unknown>) =>
       [...queryKeys.hosts.all, 'list', filters ?? {}] as const,
     detail: (id: string) => [...queryKeys.hosts.all, 'detail', id] as const,
+    deployedParts: (id: string) => [...queryKeys.hosts.all, 'deployed-parts', id] as const,
   },
   repairs: {
     all: ['repairs'] as const,
     list: (filters?: Record<string, unknown>) =>
       [...queryKeys.repairs.all, 'list', filters ?? {}] as const,
     detail: (id: string) => [...queryKeys.repairs.all, 'detail', id] as const,
+    comments: (id: string) => [...queryKeys.repairs.all, 'comments', id] as const,
+  },
+  partModels: {
+    all: ['part-models'] as const,
+    list: (filters?: Record<string, unknown>) =>
+      [...queryKeys.partModels.all, 'list', filters ?? {}] as const,
+    detail: (id: string) => [...queryKeys.partModels.all, 'detail', id] as const,
   },
   tags: {
     all: ['tags'] as const,