feat(desktop-onboarding): neue Onboarding-UI implementiert, Backup- und Rollenmanagement hinzugefügt

- Einbindung eines komplett überarbeiteten Onboarding-Screens mit validierten Eingaben für Gerätename, Sicherheitsschlüssel und Backup-Pfad.
- `SettingsManager` eingeführt zur Speicherung der Onboarding-Daten in `settings.json`.
- Navigation verbessert: Onboarding-Workflow startet, wenn Konfiguration fehlt; neues "Setup"-Icon in der Navigationsleiste hinzugefügt.
- Backend: Geräte-API und `DeviceSecurityFilter` für Authentifizierung per Sicherheitsschlüssel implementiert.

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

backend/services/identity/identity-domain/src/main/kotlin/at/mocode/identity/domain/model/Device.kt

@@ -0,0 +1,21 @@
+package at.mocode.identity.domain.model
+
+import kotlinx.datetime.Instant
+import java.util.*
+
+/**
+ * Repräsentiert eine registrierte Desktop-Instanz ("Gerät").
+ * Die Identität wird während des Onboarding-Prozesses festgelegt.
+ */
+data class Device(
+  val id: UUID = UUID.randomUUID(),
+  val name: String,
+  val securityKeyHash: String, // Gehasht für Sicherheit
+  val role: DeviceRole = DeviceRole.CLIENT,
+  val lastSyncAt: Instant? = null,
+  val createdAt: Instant
+)
+
+enum class DeviceRole {
+  MASTER, CLIENT
+}

backend/services/identity/identity-domain/src/main/kotlin/at/mocode/identity/domain/repository/DeviceRepository.kt

@@ -0,0 +1,12 @@
+package at.mocode.identity.domain.repository
+
+import at.mocode.identity.domain.model.Device
+import kotlinx.datetime.Instant
+import java.util.*
+
+interface DeviceRepository {
+  suspend fun findById(id: UUID): Device?
+  suspend fun findByName(name: String): Device?
+  suspend fun save(device: Device): Device
+  suspend fun updateLastSyncAt(id: UUID, at: Instant): Boolean
+}

backend/services/identity/identity-domain/src/main/kotlin/at/mocode/identity/domain/service/DeviceService.kt

@@ -0,0 +1,39 @@
+package at.mocode.identity.domain.service
+
+import at.mocode.identity.domain.model.Device
+import at.mocode.identity.domain.model.DeviceRole
+import at.mocode.identity.domain.repository.DeviceRepository
+import java.util.*
+import kotlin.time.Clock
+
+class DeviceService(
+  private val deviceRepository: DeviceRepository
+) {
+  suspend fun registerDevice(name: String, securityKeyHash: String, role: DeviceRole): Device {
+    val existing = deviceRepository.findByName(name)
+    if (existing != null) {
+      throw IllegalArgumentException("Gerät mit dem Namen $name existiert bereits.")
+    }
+
+    val device = Device(
+      name = name,
+      securityKeyHash = securityKeyHash,
+      role = role,
+      createdAt = Clock.System.now()
+    )
+    return deviceRepository.save(device)
+  }
+
+  suspend fun validateDeviceKey(name: String, securityKeyHash: String): Boolean {
+    val device = deviceRepository.findByName(name) ?: return false
+    return device.securityKeyHash == securityKeyHash
+  }
+
+  suspend fun getDeviceByName(name: String): Device? {
+    return deviceRepository.findByName(name)
+  }
+
+  suspend fun updateSyncTime(deviceId: UUID): Boolean {
+    return deviceRepository.updateLastSyncAt(deviceId, Clock.System.now())
+  }
+}

backend/services/identity/identity-infrastructure/src/main/kotlin/at/mocode/identity/infrastructure/persistence/DeviceTable.kt

@@ -0,0 +1,22 @@
+package at.mocode.identity.infrastructure.persistence
+
+import at.mocode.identity.domain.model.DeviceRole
+import org.jetbrains.exposed.v1.core.Table
+import org.jetbrains.exposed.v1.core.java.javaUUID
+import org.jetbrains.exposed.v1.datetime.timestamp
+
+/**
+ * Exposed Table definition für registrierte Desktop-Geräte.
+ */
+object DeviceTable : Table("identity_devices") {
+  val id = javaUUID("id").autoGenerate()
+  override val primaryKey = PrimaryKey(id)
+
+  val name = varchar("name", 100).uniqueIndex()
+  val securityKeyHash = varchar("security_key_hash", 255)
+  val role = enumerationByName("role", 20, DeviceRole::class)
+
+  val lastSyncAt = timestamp("last_sync_at").nullable()
+  val createdAt = timestamp("created_at")
+  val updatedAt = timestamp("updated_at")
+}

backend/services/identity/identity-infrastructure/src/main/kotlin/at/mocode/identity/infrastructure/persistence/ExposedDeviceRepository.kt

@@ -0,0 +1,72 @@
+package at.mocode.identity.infrastructure.persistence
+
+import at.mocode.identity.domain.model.Device
+import at.mocode.identity.domain.repository.DeviceRepository
+import org.jetbrains.exposed.v1.core.ResultRow
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.jdbc.insert
+import org.jetbrains.exposed.v1.jdbc.selectAll
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import org.jetbrains.exposed.v1.jdbc.update
+import java.util.*
+import kotlin.time.Clock
+import kotlin.time.Instant
+import kotlin.time.toJavaInstant
+
+class ExposedDeviceRepository : DeviceRepository {
+
+  override suspend fun findById(id: UUID): Device? = transaction {
+    DeviceTable.selectAll().where { DeviceTable.id eq id }
+      .map { rowToDevice(it) }
+      .singleOrNull()
+  }
+
+  override suspend fun findByName(name: String): Device? = transaction {
+    DeviceTable.selectAll().where { DeviceTable.name eq name }
+      .map { rowToDevice(it) }
+      .singleOrNull()
+  }
+
+  override suspend fun save(device: Device): Device = transaction {
+    val now = Clock.System.now()
+    val existing = DeviceTable.selectAll().where { DeviceTable.id eq device.id }.singleOrNull()
+
+    if (existing != null) {
+      DeviceTable.update({ DeviceTable.id eq device.id }) {
+        it[name] = device.name
+        it[securityKeyHash] = device.securityKeyHash
+        it[role] = device.role
+        it[lastSyncAt] = device.lastSyncAt?.toJavaInstant()
+        it[updatedAt] = now.toJavaInstant()
+      }
+    } else {
+      DeviceTable.insert {
+        it[id] = device.id
+        it[name] = device.name
+        it[securityKeyHash] = device.securityKeyHash
+        it[role] = device.role
+        it[lastSyncAt] = device.lastSyncAt?.toJavaInstant()
+        it[createdAt] = now.toJavaInstant()
+        it[updatedAt] = now.toJavaInstant()
+      }
+    }
+    device
+  }
+
+  override suspend fun updateLastSyncAt(id: UUID, at: Instant): Boolean = transaction {
+    val javaInstant = at.toJavaInstant()
+    DeviceTable.update({ DeviceTable.id eq id }) {
+      it[lastSyncAt] = javaInstant
+      it[updatedAt] = javaInstant
+    } > 0
+  }
+
+  private fun rowToDevice(row: ResultRow): Device = Device(
+    id = row[DeviceTable.id],
+    name = row[DeviceTable.name],
+    securityKeyHash = row[DeviceTable.securityKeyHash],
+    role = row[DeviceTable.role],
+    lastSyncAt = row[DeviceTable.lastSyncAt]?.let { Instant.fromEpochMilliseconds(it.toEpochMilli()) },
+    createdAt = Instant.fromEpochMilliseconds(row[DeviceTable.createdAt].toEpochMilli())
+  )
+}

backend/services/identity/identity-service/src/main/kotlin/at/mocode/identity/service/config/IdentityConfig.kt

@@ -1,7 +1,10 @@
 package at.mocode.identity.service.config
 
+import at.mocode.identity.domain.repository.DeviceRepository
 import at.mocode.identity.domain.repository.ProfileRepository
+import at.mocode.identity.domain.service.DeviceService
 import at.mocode.identity.domain.service.ProfileService
+import at.mocode.identity.infrastructure.persistence.ExposedDeviceRepository
 import at.mocode.identity.infrastructure.persistence.ExposedProfileRepository
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
@@ -15,4 +18,11 @@ class IdentityConfig {
   @Bean
   fun profileService(profileRepository: ProfileRepository): ProfileService =
     ProfileService(profileRepository)
+
+  @Bean
+  fun deviceRepository(): DeviceRepository = ExposedDeviceRepository()
+
+  @Bean
+  fun deviceService(deviceRepository: DeviceRepository): DeviceService =
+    DeviceService(deviceRepository)
 }

backend/services/identity/identity-service/src/main/kotlin/at/mocode/identity/service/web/DeviceController.kt

@@ -0,0 +1,33 @@
+package at.mocode.identity.service.web
+
+import at.mocode.identity.domain.model.Device
+import at.mocode.identity.domain.model.DeviceRole
+import at.mocode.identity.domain.service.DeviceService
+import org.springframework.web.bind.annotation.*
+
+@RestController
+@RequestMapping("/api/v1/devices")
+class DeviceController(
+  private val deviceService: DeviceService
+) {
+
+  @PostMapping("/register")
+  suspend fun registerDevice(@RequestBody request: DeviceRegisterRequest): Device {
+    return deviceService.registerDevice(
+      name = request.name,
+      securityKeyHash = request.securityKeyHash,
+      role = request.role
+    )
+  }
+
+  @GetMapping("/{name}")
+  suspend fun getDevice(@PathVariable name: String): Device? {
+    return deviceService.getDeviceByName(name)
+  }
+}
+
+data class DeviceRegisterRequest(
+  val name: String,
+  val securityKeyHash: String,
+  val role: DeviceRole
+)

backend/services/mail/mail-service/src/main/kotlin/at/mocode/mail/service/api/MailController.kt

@@ -79,7 +79,7 @@ class MailController(
       val dynamicFrom = try {
         val (user, domain) = baseMailAddress.split("@")
         "$user+${request.turnierNr}@$domain"
-      } catch (e: Exception) {
+      } catch (_: Exception) {
         baseMailAddress
       }