Add auth-client library for Elixir auth service integration

- Complete Angular client library for authentication and authorization
- JWT token management with automatic refresh and storage
- OAuth integration with social providers (Google, GitHub, etc.)
- Two-factor authentication support (TOTP and backup codes)
- Route guards for authentication and scope-based authorization
- HTTP interceptor for automatic token injection and refresh
- Comprehensive TypeScript interfaces for all API models
- User management features (profile updates, password changes)
- Cross-tab synchronization and token validation
- Complete usage guide with practical examples

🤖 Generated with [Claude Code](https://claude.ai/code)

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

projects/auth-client/src/lib/auth-client.ts

@@ -0,0 +1,15 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'lib-auth-client',
+  imports: [],
+  template: `
+    <p>
+      auth-client works!
+    </p>
+  `,
+  styles: ``
+})
+export class AuthClient {
+
+}