feat(Localization): enhance localization for tournament statistics and UI components

- Added new localization keys for tournament statistics panels across multiple languages, improving user accessibility.
- Updated the TournamentsScreen in the mobile app to include a search feature and display internal tournament statistics.
- Enhanced the Tournaments API to support fetching internal tournament statistics, providing detailed insights for users.
- Improved UI components for better organization and interaction within the tournaments section, enhancing overall user experience.

mobile-app/shared/src/commonMain/kotlin/de/tt_tagebuch/shared/api/TournamentsApi.kt

@@ -2,6 +2,7 @@ package de.tt_tagebuch.shared.api
 
 import de.tt_tagebuch.shared.api.http.AuthedHttpClient
 import de.tt_tagebuch.shared.api.models.InternalTournamentDetailDto
+import de.tt_tagebuch.shared.api.models.InternalTournamentStatsDto
 import de.tt_tagebuch.shared.api.models.InternalTournamentSummaryDto
 import io.ktor.client.call.body
 import io.ktor.client.request.get
@@ -20,4 +21,15 @@ class TournamentsApi(
     suspend fun getTournament(clubId: Int, tournamentId: Int): InternalTournamentDetailDto {
         return client.http.get("/api/tournament/$clubId/$tournamentId").body()
     }
+
+    suspend fun getInternalTournamentStats(
+        clubId: Int,
+        months: Int,
+        ageClassKeys: String?,
+    ): InternalTournamentStatsDto {
+        return client.http.get("/api/tournament/internal-stats/$clubId") {
+            parameter("months", months)
+            ageClassKeys?.let { parameter("ageClassKeys", it) }
+        }.body()
+    }
 }

mobile-app/shared/src/commonMain/kotlin/de/tt_tagebuch/shared/api/models/TournamentDtos.kt

@@ -33,6 +33,36 @@ data class InternalTournamentDetailDto(
     val bestOfEndroundSize: Int? = null,
 )
 
+@Serializable
+data class InternalTournamentStatsAgeOption(
+    val key: String,
+    val band: String? = null,
+    val bandNum: Int? = null,
+    val genderMode: String? = null,
+    @Serializable(with = FlexibleNullableBooleanSerializer::class)
+    val isNoClass: Boolean? = null,
+)
+
+@Serializable
+data class InternalTournamentStatsRow(
+    val memberId: Int = 0,
+    val firstName: String? = null,
+    val lastName: String? = null,
+    val totalPoints: Double? = null,
+    val tournamentCount: Int? = null,
+    val averagePoints: Double? = null,
+)
+
+@Serializable
+data class InternalTournamentStatsDto(
+    val months: Int? = null,
+    val fromDate: String? = null,
+    val tournamentCount: Int = 0,
+    val ageClassOptions: List<InternalTournamentStatsAgeOption> = emptyList(),
+    val absoluteRanking: List<InternalTournamentStatsRow> = emptyList(),
+    val averageRanking: List<InternalTournamentStatsRow> = emptyList(),
+)
+
 @Serializable
 data class OfficialTournamentListRowDto(
     val id: Int = 0,