feat: classify sensitive columns locally

backend/package.json

@@ -7,6 +7,7 @@
     "prebuild": "node scripts/clean-dist.mjs",
     "build": "tsc -p tsconfig.json",
     "catalog:migrate": "node dist/catalog/migrate.js",
+    "sensitivity:shadow": "node dist/catalog/sensitivity-shadow.js",
     "test": "vitest run",
     "start": "node dist/server.js",
     "test:schema-v4-verifier": "python3 -I -B scripts/test_revision_state_policy.py && node --test scripts/verify-workspace-descriptor-files.test.mjs scripts/revision-state-policy.test.mjs",
@@ -19,14 +20,17 @@
     "@types/pg": "^8.20.3",
     "fastify": "^5.0.0",
     "kysely": "^0.29.5",
+    "libphonenumber-js": "1.13.12",
     "openid-client": "6.8.5",
     "pg": "^8.22.0",
+    "validator": "13.15.35",
     "yaml": "^2.9.0",
     "zod": "^4.4.3"
   },
   "devDependencies": {
     "@testcontainers/postgresql": "^12.1.0",
     "@types/node": "24.13.3",
+    "@types/validator": "13.15.10",
     "tsx": "^4.19.0",
     "typescript": "^5.6.0",
     "vitest": "^2.1.0"