chore(ci/build): typecheck gate, npm ci, backend CI, dep+vuln fixes, hygiene

Audit remediation (build/supply-chain/quality):
- Add `@pezkuwi/api-augment` import in main.tsx -> tsc errors 416->328 (Codec-typed
  on-chain reads now augmented); add `typecheck` script + a non-blocking Typecheck CI
  step (flip to blocking once errors reach 0).
- CI: `npm install` -> `npm ci` (lockfile enforced) in web + security-audit jobs; add a
  Backend Indexer job (npm ci + node --check + non-blocking high/critical audit). No
  live tests run in CI (they need a live chain) — a mockable CI test subset is a
  follow-up.
- Vulns: bump dompurify ^3.4.12 + postcss ^8.5.23 (web prod highs cleared; only the
  react-router v7 open-redirect remains, deferred as a breaking major); backend tar
  ^7.5.22 + ws ^8.21.1 (clears the critical tar advisory). Lockfiles regenerated.
- Prod build now drops console/debugger (vite esbuild.drop); NotificationBell realtime
  subscription now returns cleanup + uses a per-user channel (fixes leak); ProfileSettings
  language codes aligned to i18n config (ku-kurmanji/ku-sorani).
- Root package.json sdk-ui path env-driven (${SDK_UI_DIR}); generate-docs rustup path
  resolved dynamically; Docker image license label MIT (matches LICENSE). Removed scratch
  files (mimari.txt, _scratch_credit_serok.mjs).

web/vite.config.ts

@@ -66,6 +66,9 @@ export default defineConfig(({ command }) => ({
   optimizeDeps: {
     include: ['@pezkuwi/util-crypto', '@pezkuwi/util', '@pezkuwi/api', '@pezkuwi/extension-dapp', '@pezkuwi/keyring', 'buffer'],
   },
+  // Strip all console.* and debugger statements from production bundles so the
+  // 600+ dev-time console calls never ship. Dev keeps full logging.
+  esbuild: command === 'build' ? { drop: ['console', 'debugger'] } : {},
   build: {
     rollupOptions: {
       external: [],