feat(domain+frontend): implement structured division warnings and enhance validation rules

- **Domain Updates:**
  - Introduced `AbteilungsWarnung` entity for structured warning handling compliant with ÖTO § 39.
  - Added validation rules for mandatory and optional division thresholds and structural completeness.
  - Implemented `CompetitionWarningService` and `AbteilungsRegelService` for domain-centric validations.
  - Updated domain models (`Bewerb`, `Abteilung`) to reflect structured warning logic.

- **Services:**
  - Expanded `BewerbService` to include warning validation through `CompetitionWarningService`.

- **Frontend Enhancements:**
  - Updated `TurnierBewerbeTab` to display warnings using tooltips with clear descriptions and structured formatting.
  - Modified `BewerbUiModel` to handle warnings and integrate them into the UI.

- **Persistence:**
  - Implemented `CompetitionRepositoryImpl` to map database rows to the new domain models and validation logic.

- **Testing:**
  - Added comprehensive unit tests for `validateStrukturellesTeilung` and division-specific warnings.
  - Enhanced existing tests to validate the new warning structure and code-based assertions.

- **Docs:**
  - Updated roadmap to reflect the completion of structural warnings implementation.

frontend/features/turnier-feature/src/commonMain/kotlin/at/mocode/turnier/feature/domain/BewerbRepository.kt

@@ -9,6 +9,13 @@ data class Bewerb(
   val sparte: String,
   val klasse: String,
   val nennungen: Int,
+  val warnungen: List<AbteilungsWarnung> = emptyList(),
+)
+
+data class AbteilungsWarnung(
+  val code: String,
+  val nachricht: String,
+  val oetoParagraph: String?
 )
 
 interface BewerbRepository {

frontend/features/turnier-feature/src/commonMain/kotlin/at/mocode/turnier/feature/presentation/BewerbViewModel.kt

@@ -114,7 +114,7 @@ class BewerbViewModel(
       scope.launch {
         manager.getConnectedPeers().collect { peers ->
           reduce { it.copy(discoveredNodes = peers.map { p ->
-              at.mocode.frontend.core.network.discovery.DiscoveredService("P2P", p, 0)
+            DiscoveredService("P2P", p, 0)
           }) }
         }
       }

frontend/features/turnier-feature/src/jvmMain/kotlin/at/mocode/turnier/feature/presentation/TurnierBewerbeTab.kt

@@ -11,7 +11,9 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Refresh
+import androidx.compose.material.icons.filled.Warning
 import androidx.compose.material3.*
+import androidx.compose.material3.TooltipAnchorPosition
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -293,6 +295,7 @@ private fun RowScope.TableHeaderCell(text: String, width: androidx.compose.ui.un
   )
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun BewerbeTableRow(bewerb: BewerbUiModel, isSelected: Boolean, onClick: () -> Unit) {
   Row(
@@ -315,6 +318,30 @@ private fun BewerbeTableRow(bewerb: BewerbUiModel, isSelected: Boolean, onClick:
     Text(bewerb.beginn, fontSize = 12.sp, modifier = Modifier.width(55.dp))
     Text(bewerb.ende, fontSize = 12.sp, modifier = Modifier.width(55.dp))
     Text(bewerb.name, fontSize = 12.sp, modifier = Modifier.weight(1f), maxLines = 2)
+    if (bewerb.warnungen.isNotEmpty()) {
+      TooltipBox(
+        positionProvider = TooltipDefaults.rememberTooltipPositionProvider(),
+        tooltip = {
+          PlainTooltip {
+            Column {
+              bewerb.warnungen.forEach { warnung ->
+                Text("${warnung.oetoParagraph ?: ""}: ${warnung.nachricht}", fontSize = 11.sp)
+              }
+            }
+          }
+        },
+        state = rememberTooltipState(),
+      ) {
+        Icon(
+          Icons.Default.Warning,
+          contentDescription = "Warnungen vorhanden",
+          modifier = Modifier.padding(horizontal = 4.dp).size(16.dp),
+          tint = Color(0xFFFACC15) // Yellow-400
+        )
+      }
+    } else {
+      Spacer(Modifier.width(24.dp))
+    }
     Text("${bewerb.zns}", fontSize = 12.sp, modifier = Modifier.width(45.dp))
     Text("${bewerb.nennungen}", fontSize = 12.sp, modifier = Modifier.width(75.dp))
   }
@@ -484,7 +511,8 @@ private fun BewerbListItem.toUiModel() = BewerbUiModel(
   typ = "",
   zeile1 = "",
   zns = 1,
-  nennungen = nennungen
+  nennungen = nennungen,
+  warnungen = warnungen
 )
 
 @Composable
@@ -839,6 +867,7 @@ data class BewerbUiModel(
   val zeile1: String,
   val zns: Int,
   val nennungen: Int,
+  val warnungen: List<at.mocode.turnier.feature.domain.AbteilungsWarnung> = emptyList(),
 )
 
 private fun sampleBewerbe() = listOf(
@@ -853,7 +882,8 @@ private fun sampleBewerbe() = listOf(
     "Dressur",
     "Pony Einsteiger Cup OO",
     0,
-    0
+    0,
+    emptyList()
   ),
   BewerbUiModel(
     "28.05.2023",
@@ -866,7 +896,8 @@ private fun sampleBewerbe() = listOf(
     "Dressur",
     "Pony Einsteiger Cup OO",
     0,
-    0
+    0,
+    emptyList()
   ),
   BewerbUiModel(
     "28.05.2023",