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/eslint.config.js

@@ -2,6 +2,9 @@ import { configs } from "@macalinao/eslint-config";
 
 export default [
   ...configs.fast,
+  {
+    ignores: ["**/*.test.ts"],
+  },
   {
     languageOptions: {
       parserOptions: {