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/analytics.ts

@@ -18,10 +18,12 @@ export interface BinCount {
   count: number;
 }
 
-export interface ManufacturerEolSummary {
+export interface PartModelEolSummary {
+  partModelId: string;
+  mpn: string;
   manufacturerId: string;
-  name: string;
-  eolDate: string | null;
+  manufacturerName: string;
+  eolDate: string;
   deployedCount: number;
 }
 
@@ -30,6 +32,6 @@ export interface DashboardAnalytics {
   byState: StateCount[];
   ageBuckets: AgeBucket[];
   topBins: BinCount[];
-  deployedPastEol: ManufacturerEolSummary[];
+  deployedPastEol: PartModelEolSummary[];
   openRepairs: number;
 }