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>

packages/api-contract/package.json

@@ -12,6 +12,7 @@
   },
   "scripts": {
     "build": "tsc",
+    "test": "bun test",
     "clean": "tsc --build --clean && rm -rf dist/ node_modules/ .eslintcache",
     "lint": "eslint . --cache"
   },