feat(sprint7): Phase 2.5 — Club Event Calendar

- Flyway V14: club_events + event_rsvps tables with reminder_sent tracking
- Enums: EventType, RsvpStatus, RecurrenceRule + extend AuditEventType/NotificationType
- Entities: ClubEvent (extends AbstractTenantEntity), EventRsvp (unique event+member)
- Repositories: ClubEventRepository, EventRsvpRepository with date-range and status queries
- EventService: CRUD, RSVP with maxAttendees enforcement (409 if full), iCal RFC 5545 generation, recurring event virtual expansion, notifications on create/cancel, auto-post to Info Board
- EventReminderScheduler: hourly check, 24h reminder to ACCEPTED/MAYBE attendees
- EventController: admin CRUD (MANAGE_INFO_BOARD permission), portal upcoming events, RSVP endpoint, iCal download (text/calendar), attendee list
- Frontend: events.ts service (React Query hooks matching apiClient pattern), admin calendar page (month grid with event dots, create dialog, event cards), portal events page (RSVP buttons, capacity display)
- Navigation: added Kalender with Calendar icon
- i18n: events.* keys in de.json and en.json
- UI: added @radix-ui/react-switch + Switch component

cannamanage-frontend/messages/de.json

@@ -772,5 +772,41 @@
     "noPosts": "Noch keine Beiträge vorhanden. Erstelle den ersten Beitrag!",
     "confirmDelete": "Möchtest du diesen Beitrag wirklich löschen?",
     "unreadCount": "{count} ungelesen"
+  },
+  "events": {
+    "title": "Kalender",
+    "description": "Veranstaltungen und Termine des Vereins",
+    "portalTitle": "Veranstaltungen",
+    "portalDescription": "Kommende Termine und Events deines Vereins",
+    "createEvent": "Veranstaltung erstellen",
+    "upcomingEvents": "Nächste Termine",
+    "noUpcomingEvents": "Keine anstehenden Veranstaltungen",
+    "noEventsOnDay": "Keine Veranstaltungen an diesem Tag",
+    "cancel": "Absagen",
+    "full": "Ausgebucht",
+    "form": {
+      "title": "Titel",
+      "type": "Art",
+      "start": "Beginn",
+      "end": "Ende",
+      "location": "Ort",
+      "description": "Beschreibung",
+      "maxAttendees": "Max. Teilnehmer",
+      "recurring": "Wiederkehrend",
+      "recurrenceRule": "Wiederholung",
+      "recurrenceEnd": "Enddatum"
+    },
+    "rsvp": {
+      "accept": "Zusage",
+      "decline": "Absage",
+      "maybe": "Vielleicht"
+    },
+    "types": {
+      "MEETING": "Mitgliederversammlung",
+      "HARVEST_FESTIVAL": "Erntefest",
+      "BOARD_MEETING": "Vorstandssitzung",
+      "WORKSHOP": "Workshop",
+      "OTHER": "Sonstiges"
+    }
   }
 }