Add Shadcn Form components with vee-validate and zod integration

- Install Shadcn Form components (FormControl, FormDescription, FormItem, FormLabel, FormMessage)
- Add vee-validate 4.15.1 for form validation
- Add zod 3.25.76 for schema validation
- Add @vee-validate/zod 4.15.1 for integration
- Update reka-ui to 2.5.0
- Prepare foundation for proper form handling with type-safe validation
- Enables proper checkbox array handling and form accessibility

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/ui/form/FormLabel.vue

@@ -0,0 +1,25 @@
+<script lang="ts" setup>
+import type { LabelProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { cn } from "@/lib/utils"
+import { Label } from '@/components/ui/label'
+import { useFormField } from "./useFormField"
+
+const props = defineProps<LabelProps & { class?: HTMLAttributes["class"] }>()
+
+const { error, formItemId } = useFormField()
+</script>
+
+<template>
+  <Label
+    data-slot="form-label"
+    :data-error="!!error"
+    :class="cn(
+      'data-[error=true]:text-destructive',
+      props.class,
+    )"
+    :for="formItemId"
+  >
+    <slot />
+  </Label>
+</template>