docs: add event details and session log for Neumarkt 2026 tournaments

- Added competition details for Neumarkt tournaments 26128 and 26129 under `docs/Neumarkt2026/`.
- Logged key outcomes of the Domain Workshop follow-up and Frontend Kick-off session under `docs/99_Journal/2026-03-18_Session_Log_Domain_und_Frontend_Kickoff.md`.
- Updated `frontend/shells/meldestelle-portal` with new routing and UI components for Landing Page, Dashboard, and Tournament creation flow.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/core/navigation/src/commonMain/kotlin/at/mocode/frontend/core/navigation/AppScreen.kt

@@ -3,6 +3,8 @@ package at.mocode.frontend.core.navigation
 sealed class AppScreen(val route: String) {
   data object Landing : AppScreen(Routes.HOME)
   data object Home : AppScreen("/home")
+  data object Dashboard : AppScreen("/dashboard")
+  data object CreateTournament : AppScreen("/tournament/create") // Neuer Screen
   data object Login : AppScreen(Routes.LOGIN)
   data object Ping : AppScreen("/ping")
   data object Profile : AppScreen("/profile")
@@ -13,6 +15,8 @@ sealed class AppScreen(val route: String) {
       return when (route) {
         Routes.HOME -> Landing
         "/home" -> Home
+        "/dashboard" -> Dashboard
+        "/tournament/create" -> CreateTournament
         Routes.LOGIN, Routes.Auth.LOGIN -> Login
         "/ping" -> Ping
         "/profile" -> Profile