feat: add server category support to SurfCoreApi and its implementations

- Extend `SurfCoreApi` with `getCurrentServerCategory` method.
- Update all implementations (`Paper` and `Velocity`) to include server category retrieval.
- Modify `SurfServerConfig` to include a `serverCategory` field.

Author: TheBjoRedCraft

surf-core-api/surf-core-api-common/src/main/kotlin/dev/slne/surf/core/api/common/SurfCoreApi.kt

@@ -13,6 +13,7 @@ interface SurfCoreApi {
     fun getPlayer(uuid: UUID): SurfPlayer?
 
     fun getCurrentServerName(): String
+    fun getCurrentServerCategory(): String
 
     suspend fun getOfflinePlayer(name: String): SurfPlayer?
     suspend fun getOfflinePlayer(uuid: UUID): SurfPlayer?

surf-core-core/surf-core-core-common/src/main/kotlin/dev/slne/surf/core/core/common/config/SurfServerConfig.kt

@@ -5,4 +5,5 @@ import org.spongepowered.configurate.objectmapping.ConfigSerializable
 @ConfigSerializable
 data class SurfServerConfig(
     val serverName: String = "unknown",
+    val serverCategory: String = "unknown"
 )

surf-core-paper/src/main/kotlin/dev/slne/surf/core/paper/api/SurfCoreApiPaperImpl.kt

@@ -9,4 +9,5 @@ import net.kyori.adventure.util.Services
 @AutoService(SurfCoreApi::class)
 class SurfCoreApiPaperImpl : SurfCoreApiImpl(), Services.Fallback {
     override fun getCurrentServerName() = surfServerConfig.serverName
+    override fun getCurrentServerCategory() = surfServerConfig.serverCategory
 }

surf-core-velocity/src/main/kotlin/dev/slne/surf/core/velocity/api/SurfCoreApiVelocityImpl.kt

@@ -9,4 +9,5 @@ import net.kyori.adventure.util.Services
 @AutoService(SurfCoreApi::class)
 class SurfCoreApiVelocityImpl : SurfCoreApiImpl(), Services.Fallback {
     override fun getCurrentServerName() = surfServerConfig.serverName
+    override fun getCurrentServerCategory() = surfServerConfig.serverCategory
 }