feat: implement newsletter subscription feature with new forms and database structure

- Added new newsletter subscription functionality to the participation page.
- Created a new `NewsletterForm` component to handle user subscriptions.
- Introduced `NewsletterSubscriptions` collection to manage subscriptions in the database.
- Developed migration script to set up necessary database tables and fields for the newsletter feature.
- Refactored participation content to remove deprecated newsletter phase data and integrate new structure.
- Updated the `Participation` page to utilize the new newsletter form and handle different application phases.

src/NewsletterForm/config.ts

@@ -0,0 +1,78 @@
+import type { Field, GlobalConfig } from 'payload'
+
+import { authenticated } from '@/access/authenticated'
+import { defaultNewsletterFormData, type NewsletterInterestCopy } from '@/spa/newsletterForm'
+
+const text = (name: string, label: string, defaultValue: string): Field => ({
+  name,
+  type: 'text',
+  label,
+  defaultValue,
+})
+
+const textarea = (name: string, label: string, defaultValue: string): Field => ({
+  name,
+  type: 'textarea',
+  label,
+  defaultValue,
+})
+
+const variantFields = (defaults: NewsletterInterestCopy, benefitsDbName: string): Field[] => [
+  text('eyebrow', 'Linke Eyebrow', defaults.eyebrow),
+  textarea('heading', 'Linke Überschrift', defaults.heading),
+  textarea('body', 'Linker Beschreibungstext', defaults.body),
+  {
+    name: 'benefits',
+    label: 'Vorteile',
+    type: 'array',
+    dbName: benefitsDbName,
+    defaultValue: defaults.benefits,
+    fields: [text('num', 'Nummer', ''), text('label', 'Titel', ''), text('desc', 'Beschreibung', '')],
+  },
+  text('formEyebrow', 'Formular-Eyebrow', defaults.formEyebrow),
+  text('formTitle', 'Formular-Überschrift', defaults.formTitle),
+  textarea('formBody', 'Formular-Beschreibung', defaults.formBody),
+  text('emailLabel', 'E-Mail-Feldbezeichnung', defaults.emailLabel),
+  text('emailPlaceholder', 'E-Mail-Platzhalter', defaults.emailPlaceholder),
+  text('submitLabel', 'Button-Beschriftung', defaults.submitLabel),
+  textarea('privacy', 'Datenschutz-Hinweis', defaults.privacy),
+  text('validationRequired', 'Fehler: E-Mail fehlt', defaults.validationRequired),
+  text('validationInvalid', 'Fehler: E-Mail ungültig', defaults.validationInvalid),
+  textarea('submissionError', 'Fehler: Speichern fehlgeschlagen', defaults.submissionError),
+  text('successHeading', 'Erfolgsüberschrift', defaults.successHeading),
+  textarea('successBody', 'Erfolgstext', defaults.successBody),
+  text('footnote', 'Fußzeile normal', defaults.footnote),
+  text('footnoteStrong', 'Fußzeile hervorgehoben', defaults.footnoteStrong),
+]
+
+export const NewsletterForm: GlobalConfig = {
+  slug: 'newsletter-form',
+  label: 'Newsletter-Formular',
+  access: {
+    read: () => true,
+    update: authenticated,
+  },
+  admin: {
+    group: 'Formulare',
+  },
+  fields: [
+    {
+      name: 'evaluation',
+      label: 'Phase 02 · Jury / Auswertung',
+      type: 'group',
+      admin: {
+        description: 'Gemeinsamer Newsletter-Inhalt für Startseite und Teilnahme-Seite während der Auswertungsphase.',
+      },
+      fields: variantFields(defaultNewsletterFormData.evaluation, 'newsletter_eval_bens'),
+    },
+    {
+      name: 'completed',
+      label: 'Phase 03 · Preisverleihung abgeschlossen',
+      type: 'group',
+      admin: {
+        description: 'Gemeinsamer Newsletter-Inhalt für Startseite und Teilnahme-Seite nach Abschluss des Preisjahrgangs.',
+      },
+      fields: variantFields(defaultNewsletterFormData.completed, 'newsletter_done_bens'),
+    },
+  ],
+}