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/package-lock.json

@@ -58,7 +58,7 @@
         "clsx": "^2.1.1",
         "cmdk": "^1.0.0",
         "date-fns": "^3.6.0",
-        "dompurify": "^3.3.1",
+        "dompurify": "^3.4.12",
         "embla-carousel-react": "^8.3.0",
         "highlight.js": "^11.9.0",
         "i18next": "^23.7.6",
@@ -103,7 +103,7 @@
         "globals": "^15.15.0",
         "husky": "^9.1.7",
         "jsdom": "^27.2.0",
-        "postcss": "^8.4.47",
+        "postcss": "^8.5.23",
         "tailwindcss": "^3.4.11",
         "typescript": "^5.5.3",
         "typescript-eslint": "^8.0.1",
@@ -7651,9 +7651,9 @@
       }
     },
     "node_modules/dompurify": {
-      "version": "3.4.10",
-      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.10.tgz",
-      "integrity": "sha512-0xzNv0e7oYC6yyuOGZIABPM4qtg3QxLFniDNPP4ZP90wR8Yq3zgwpRbrNiT4N3IKqDbbYFEJLV+JWEs19aZ//w==",
+      "version": "3.4.12",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.12.tgz",
+      "integrity": "sha512-zQvGet8Z2sWbQhCmfFz/T5QWH2oBmjnqK3qvOjaqaNLrLEF912WamU+ohnTp0TCep/MFVHpdJuCZEdFOdTnEFg==",
       "license": "(MPL-2.0 OR Apache-2.0)",
       "optionalDependencies": {
         "@types/trusted-types": "^2.0.7"
@@ -10054,9 +10054,9 @@
       }
     },
     "node_modules/nanoid": {
-      "version": "3.3.11",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.11.tgz",
-      "integrity": "sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==",
+      "version": "3.3.16",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.16.tgz",
+      "integrity": "sha512-bzlKTyNJ7+LdGIIwy8ijFpIqEQIvafahV7eYykJ8Cvh42EdJeODoJ6gUJXpQJvej1BddH8OqTXZNE/KfbWAu8Q==",
       "funding": [
         {
           "type": "github",
@@ -10800,9 +10800,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.13",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.13.tgz",
-      "integrity": "sha512-qif0+jGGZoLWdHey3UFHHWP0H7Gbmsk8T5VEqyYFbWqPr1XqvLGBbk/sl8V5exGmcYJklJOhOQq1pV9IcsiFag==",
+      "version": "8.5.23",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.23.tgz",
+      "integrity": "sha512-g50586zr4bZmwFiTlflMu8E0bDTb5I5gertgwAKmsdUlTQIhZtunzUlD1WSzwcVWPoAVpsrA6vlfCD7oXvRwgg==",
       "funding": [
         {
           "type": "opencollective",
@@ -10819,7 +10819,7 @@
       ],
       "license": "MIT",
       "dependencies": {
-        "nanoid": "^3.3.11",
+        "nanoid": "^3.3.16",
         "picocolors": "^1.1.1",
         "source-map-js": "^1.2.1"
       },