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/FormControl.vue

@@ -0,0 +1,36 @@
+<script setup lang="ts">
+import type { PrimitiveProps } from 'reka-ui'
+import { inject } from 'vue'
+import { Primitive } from 'reka-ui'
+import { useFieldError } from 'vee-validate'
+import type { FormItemContext } from '.'
+import { FORM_ITEM_INJECT_KEY } from '.'
+
+/**
+ * FormControl component - Wrapper for form input elements
+ * Provides accessibility attributes and connects to form validation
+ */
+
+interface Props extends PrimitiveProps {}
+
+const props = withDefaults(defineProps<Props>(), {
+  as: 'div',
+})
+
+// Get the form item context for ID
+const formItemContext = inject<FormItemContext>(FORM_ITEM_INJECT_KEY)
+
+// Get field validation state from the nearest parent field
+const error = useFieldError()
+</script>
+
+<template>
+  <Primitive
+    :id="formItemContext?.id"
+    v-bind="props"
+    :aria-describedby="error ? `${formItemContext?.id}-message` : undefined"
+    :aria-invalid="!!error"
+  >
+    <slot />
+  </Primitive>
+</template>