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>

eslint.config.mjs

@@ -20,6 +20,15 @@ const eslintConfig = [
       ],
     },
   },
+  {
+    // Tests assert response shape via expect() — narrowing every
+    // `res.json()` to a structural type adds boilerplate without catching
+    // bugs. Allow `any` casts at JSON boundaries in test files.
+    files: ["tests/**/*.ts", "tests/**/*.tsx"],
+    rules: {
+      "@typescript-eslint/no-explicit-any": "off",
+    },
+  },
   {
     ignores: ["client-portal/**", "next-env.d.ts"],
   },