feat(manufacturers): detail page with MPN-level insights

Adds /manufacturers/:id with vendor-wide KPIs, top MPNs by units,
failures by MPN, category mix, past-EOL exposure, and a filtered
PartModels table. Wires upstream links from PartDetail and
PartModelDetail so the manufacturer name is a navigable anchor.

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

apps/web/src/lib/api/manufacturers.ts

@@ -1,5 +1,6 @@
 import type {
   CreateManufacturerRequest,
+  ManufacturerInsights,
   UpdateManufacturerRequest,
 } from '@vector/shared';
 import { api } from './client.js';
@@ -15,6 +16,16 @@ export function listManufacturers(filters: ManufacturerListFilters = {}) {
   return getList<Manufacturer>('/manufacturers', filters);
 }
 
+export async function getManufacturer(id: string): Promise<Manufacturer> {
+  const res = await api.get<Manufacturer>(`/manufacturers/${id}`);
+  return res.data;
+}
+
+export async function getManufacturerInsights(id: string): Promise<ManufacturerInsights> {
+  const res = await api.get<ManufacturerInsights>(`/manufacturers/${id}/insights`);
+  return res.data;
+}
+
 export async function createManufacturer(input: CreateManufacturerRequest): Promise<Manufacturer> {
   const res = await api.post<Manufacturer>('/manufacturers', input);
   return res.data;

apps/web/src/lib/api/types.ts

@@ -15,6 +15,7 @@ export interface Manufacturer {
   name: string;
   createdAt: string;
   updatedAt: string;
+  _count?: { parts: number; partModels: number };
 }
 
 export interface PartModel {

apps/web/src/lib/queryKeys.ts

@@ -20,6 +20,7 @@ export const queryKeys = {
     list: (filters?: Record<string, unknown>) =>
       [...queryKeys.manufacturers.all, 'list', filters ?? {}] as const,
     detail: (id: string) => [...queryKeys.manufacturers.all, 'detail', id] as const,
+    insights: (id: string) => [...queryKeys.manufacturers.all, 'insights', id] as const,
   },
   sites: {
     all: ['sites'] as const,