feat(frontend+billing): integrate billing UI and navigation into Turnier module

- **Navigation Updates:**
  - Added `AppScreen.Billing` route for participant billing linked to an event and tournament.

- **UI Additions:**
  - Introduced `BillingScreen` and `BillingViewModel` for participant account management and manual transactions.
  - Updated `TurnierAbrechnungTab` to include `BillingScreen` and enable account interaction.

- **Turnier Enhancements:**
  - Enhanced `NennungenTabContent` to support navigation to billing via a new interaction.
  - Added billing feature as a dependency to `turnier-feature`.

- **Billing Domain:**
  - Extended `Money` to include subtraction operation and improved formatting for negative amounts.
  - Added DTOs (`TeilnehmerKontoDto`, `BuchungDto`, `BuchungRequest`) for seamless data exchange with backend.

- **Test Improvements:**
  - Updated `PreviewTurnierAbrechnungTab` to include interactive billing placeholder.

- **Misc Updates:**
  - Enhanced breadcrumb navigation for billing in `DesktopMainLayout` for better user experience.

backend/services/entries/entries-service/src/main/kotlin/at/mocode/entries/service/tenant/ExposedTenantTransactions.kt

@@ -12,7 +12,7 @@ inline fun <T> tenantTransaction(crossinline block: () -> T): T = transaction {
   // Set search_path for this transaction/connection
   val dialect = TransactionManager.current().db.vendor
   if (dialect == "postgresql") {
-    TransactionManager.current().exec("SET search_path TO \"$schema\"")
+    TransactionManager.current().exec("SET search_path TO \"$schema\", pg_catalog")
   } else if (dialect == "h2") {
     TransactionManager.current().exec("SET SCHEMA \"$schema\"")
   }