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/tsconfig.json

@@ -2,5 +2,6 @@
   "extends": "@macalinao/tsconfig/tsconfig.base.json",
   "compilerOptions": {
     "isolatedDeclarations": false
-  }
+  },
+  "exclude": ["**/*.test.ts"]
 }