Implement authentication phase with Cidaas OAuth2 integration

- Add authentication middleware to protect routes
- Create API endpoints for login, logout, registration, and user info
- Develop UI components for login and registration forms
- Integrate VeeValidate for form validation
- Update environment configuration for Cidaas settings
- Add i18n support for English and German languages
- Enhance Tailwind CSS for improved styling of auth components
- Document authentication flow and testing procedures

app/components/ui/form/index.ts

@@ -0,0 +1,13 @@
+export { default as FormField } from './FormField.vue'
+export { default as FormItem } from './FormItem.vue'
+export { default as FormLabel } from './FormLabel.vue'
+export { default as FormControl } from './FormControl.vue'
+export { default as FormMessage } from './FormMessage.vue'
+export { default as FormDescription } from './FormDescription.vue'
+
+// Inject keys for form field context
+export const FORM_ITEM_INJECT_KEY = Symbol('form-item-inject-key')
+
+export interface FormItemContext {
+  id: string
+}