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/FormField.vue

@@ -0,0 +1,20 @@
+<script setup lang="ts">
+import { Field } from 'vee-validate'
+
+/**
+ * FormField component - Wraps vee-validate Field component
+ * Provides form validation and error handling
+ */
+
+interface Props {
+  name: string
+}
+
+defineProps<Props>()
+</script>
+
+<template>
+  <Field v-slot="{ field, errorMessage, meta }" :name="name">
+    <slot :field="field" :error-message="errorMessage" :meta="meta" />
+  </Field>
+</template>