feat: warm-up deps — ts-reset, web-vitals, RHF devtool, query-broadcast

Four low-risk adds before the Zod 4 / drizzle-zod headliner:

- @total-typescript/ts-reset: tightens TS stdlib types globally (JSON.parse
  → unknown, fetch().json() → unknown, .filter(Boolean) narrows, Set
  literals respect typed Set targets). Caught 179 latent type errors;
  fixed all production sites (8 files) and added `any` cast escape hatch
  in test files (ESLint exemption scoped to tests/).
- web-vitals + /api/v1/internal/vitals endpoint + WebVitalsReporter
  client component: establishes Core Web Vitals baseline (LCP/INP/CLS/
  FCP/TTFB) via navigator.sendBeacon. Required before optimisation work.
- @hookform/devtools + FormDevtool wrapper: dev-only RHF state inspector,
  lazy-loaded via next/dynamic so the chunk is excluded from prod
  bundles entirely.
- @tanstack/query-broadcast-client-experimental: cross-tab cache sync
  via BroadcastChannel — wired in query-provider.tsx, 1-liner.

Audit doc updated with sections 35 + 36 (PDF stack overhaul + comprehensive
second-pass package sweep) covering ~20 package adoption candidates and
4-5 deprecation candidates.

Verified: tsc clean, vitest 1293/1293 pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/integration/api/yachts.test.ts

@@ -22,7 +22,7 @@ describe('POST /api/v1/yachts (createHandler)', () => {
     });
     const res = await createHandler(req, ctx, {});
     expect(res.status).toBe(201);
-    const body = await res.json();
+    const body = (await res.json()) as any;
     expect(body.data.name).toBe('Sea Breeze');
     expect(body.data.currentOwnerId).toBe(client.id);
   });
@@ -63,7 +63,7 @@ describe('GET /api/v1/yachts (listHandler)', () => {
     const req = makeMockRequest('GET', 'http://localhost/api/v1/yachts?page=1&limit=20&order=desc');
     const res = await listHandler(req, ctx, {});
     expect(res.status).toBe(200);
-    const body = await res.json();
+    const body = (await res.json()) as any;
     expect(body.data.some((y: { name: string }) => y.name === 'Listed')).toBe(true);
     expect(body.pagination.page).toBe(1);
     expect(body.pagination.pageSize).toBe(20);