feat(logging): deepen coordinator and core logging (NCS-72)

Coordinator: InstanceRegistry logs instance join/update/dead/remove;
CoordinatorGrpcServer logs new stream + first heartbeat per instance;
CoreGrpcClient logs channel open/evict and RPC success counts.

Core: GameResource replaces println with logger; RedisGameRegistry
logs store/Redis-load/DB-load and surfaces silent failures;
CoordinatorServiceHandler logs inbound gRPC commands; IoGrpcClientWrapper
and RuleSetGrpcAdapter wrap gRPC calls with WARN on failure.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/bot-platform/src/main/scala/de/nowchess/botplatform/resource/BotEventResource.scala

@@ -64,6 +64,6 @@ class BotEventResource:
   ): Response =
     val playerId = Option(jwt.getSubject).getOrElse("")
     log.debugf("Bot move %s in game %s by player %s", uci, gameId, playerId)
-    val moveMsg  = s"""{"type":"MOVE","uci":"$uci","playerId":"$playerId"}"""
+    val moveMsg = s"""{"type":"MOVE","uci":"$uci","playerId":"$playerId"}"""
     redis.pubsub(classOf[String]).publish(s"${redisConfig.prefix}:game:$gameId:c2s", moveMsg)
     Response.ok().build()