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/FormItem.vue

@@ -0,0 +1,30 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from 'vue'
+import { provide } from 'vue'
+import { useId } from 'reka-ui'
+import { cn } from '~/lib/utils'
+import { FORM_ITEM_INJECT_KEY } from '.'
+
+/**
+ * FormItem component - Container for form fields with proper spacing
+ * Provides unique ID context for label and error message association
+ */
+
+interface Props {
+  class?: HTMLAttributes['class']
+}
+
+const props = defineProps<Props>()
+
+// Generate unique ID for this form item
+const id = useId()
+
+// Provide the ID to child components (FormLabel, FormControl, FormMessage)
+provide(FORM_ITEM_INJECT_KEY, { id })
+</script>
+
+<template>
+  <div :class="cn('space-y-2', props.class)">
+    <slot />
+  </div>
+</template>