Implement ticket panel synchronization and configuration updates

- Added `panelChannelId` and `panelMessageId` fields to the `TicketConfig` model for managing ticket panel settings.
- Introduced `syncTicketPanel` function to handle posting and updating the ticket panel in Discord channels via BullMQ.
- Enhanced error handling for ticket panel synchronization, including specific error messages for missing categories and posting failures.
- Updated WebUI components to support panel channel selection and improved error messaging for synchronization issues.
- Added localization entries for new error messages related to ticket panel synchronization in both English and German.
- Refactored ticket category management to trigger panel synchronization upon category creation, update, or deletion.

apps/bot/prisma/migrations/20260725160000_ticket_panel/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "TicketConfig" ADD COLUMN "panelChannelId" TEXT;
+ALTER TABLE "TicketConfig" ADD COLUMN "panelMessageId" TEXT;

apps/bot/prisma/schema.prisma

@@ -513,6 +513,8 @@ model TicketConfig {
   mode               String   @default("CHANNEL")
   categoryId         String?
   logChannelId       String?
+  panelChannelId     String?
+  panelMessageId     String?
   transcriptDm       Boolean  @default(false)
   inactivityHours    Int      @default(72)
   ratingEnabled      Boolean  @default(true)