feat(tournament): remove dynamic server add/remove endpoints

Servers are now configured via TOURNAMENT_EXTERNAL_SERVERS env var.
POST /api/tournament/servers and DELETE /api/tournament/servers/{id}
are removed; only GET (list) remains for the bot's fetchRemoteServers call.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/tournament/src/main/scala/de/nowchess/tournament/config/NativeReflectionConfig.scala

@@ -33,7 +33,6 @@ import io.quarkus.runtime.annotations.RegisterForReflection
     classOf[CoreGameResponse],
     classOf[GameWritebackEventDto],
     classOf[ExternalTournamentServer],
-    classOf[RegisterServerRequest],
     classOf[ExternalTournamentServerList],
   ),
 )

modules/tournament/src/main/scala/de/nowchess/tournament/dto/ExternalServer.scala

@@ -1,5 +1,4 @@
 package de.nowchess.tournament.dto
 
 case class ExternalTournamentServer(id: String, label: String, url: String)
-case class RegisterServerRequest(label: String, url: String)
 case class ExternalTournamentServerList(servers: List[ExternalTournamentServer])

modules/tournament/src/main/scala/de/nowchess/tournament/resource/TournamentServerResource.scala

@@ -1,6 +1,6 @@
 package de.nowchess.tournament.resource
 
-import de.nowchess.tournament.dto.{ErrorDto, ExternalTournamentServerList, RegisterServerRequest}
+import de.nowchess.tournament.dto.ExternalTournamentServerList
 import de.nowchess.tournament.service.TournamentServerRegistry
 import jakarta.annotation.security.RolesAllowed
 import jakarta.enterprise.context.ApplicationScoped
@@ -23,13 +23,3 @@ class TournamentServerResource:
   @GET
   def list(): Response =
     Response.ok(ExternalTournamentServerList(registry.list())).build()
-
-  @POST
-  def register(req: RegisterServerRequest): Response =
-    Response.status(201).entity(registry.register(req.label, req.url)).build()
-
-  @DELETE
-  @Path("/{id}")
-  def remove(@PathParam("id") id: String): Response =
-    if registry.remove(id) then Response.noContent().build()
-    else Response.status(Response.Status.NOT_FOUND).entity(ErrorDto(s"Server $id not found")).build()