Remove unused PacketEnvironmentDsl annotation from EnvironmentAPI.

Author: peco2282

packet/src/main/kotlin/com/peco2282/devcore/packet/environment/EnvironmentAPI.kt

@@ -3,9 +3,6 @@ package com.peco2282.devcore.packet.environment
 import org.bukkit.Location
 import org.bukkit.entity.Player
 
-/** DSL marker annotation for the environment DSL scope. */
-@DslMarker
-annotation class PacketEnvironmentDsl
 
 /**
  * Hub interface for packet-based environment manipulation.