Implement Workstream F1: me.get and me.setupProfile procedures

- Add me.get procedure returning user profile with needsSetup flag
- Add me.setupProfile procedure for initial profile setup after signup
- Add nonEmptyString/optionalString schema helpers with tests
- Use Web Crypto API (SubtleCrypto) for Cloudflare Workers compatibility
- Use @formatjs/intl-durationformat for duration formatting
- Remove node:crypto dependency from crypto utilities

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/package.json

@@ -11,6 +11,7 @@
     "clean": "rm -rf dist .eslintcache"
   },
   "dependencies": {
+    "@formatjs/intl-durationformat": "^0.9.2",
     "@noble/hashes": "^2.0.1",
     "@orpc/server": "^1.13.2",
     "@reviq/api-contract": "workspace:*",