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/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "auth-client",
+  "version": "0.0.1",
+  "peerDependencies": {
+    "@angular/common": "^20.2.0",
+    "@angular/core": "^20.2.0"
+  },
+  "dependencies": {
+    "tslib": "^2.3.0"
+  },
+  "sideEffects": false
+}