fix(contact): use direct fetch instead of contracts client for form submission

The @c2s/payload-contracts API client does not load properly in client-side
bundles. Use direct fetch() for the form submission POST request.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/blocks/ContactFormBlock.tsx

@@ -5,7 +5,8 @@ import { motion } from 'framer-motion'
 import { Container } from '../ui/Container'
 import { Button } from '../ui/Button'
 import { cn } from '@/lib/utils'
-import { submitContactForm } from '@/lib/api'
+
+const PAYLOAD_URL = process.env.NEXT_PUBLIC_PAYLOAD_URL || 'https://cms.c2sgmbh.de'
 
 interface ContactFormBlockProps {
   block: Record<string, unknown>
@@ -28,13 +29,21 @@ export function ContactFormBlock({ block }: ContactFormBlockProps) {
 
     try {
       const formData = new FormData(e.currentTarget)
-      await submitContactForm({
-        name: formData.get('name') as string,
-        email: formData.get('email') as string,
-        subject: formData.get('subject') as string,
-        message: formData.get('message') as string,
-        formId: formId || undefined,
+      const res = await fetch(`${PAYLOAD_URL}/api/form-submissions`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          form: formId || 1,
+          submissionData: [
+            { field: 'name', value: formData.get('name') as string },
+            { field: 'email', value: formData.get('email') as string },
+            { field: 'subject', value: formData.get('subject') as string },
+            { field: 'message', value: formData.get('message') as string },
+          ],
+        }),
       })
+
+      if (!res.ok) throw new Error(`HTTP ${res.status}`)
       setStatus('success')
     } catch {
       setStatus('error')