feat(D-01/E): quickwins — debug toggle, HumanChairHelper move, collar equip

Q1: Remove F9 debug toggle from GltfAnimationApplier + delete dead
    GltfRenderLayer + remove keybind registration

Q2: Move HumanChairHelper from state/ to util/ — pure utility with
    no state dependency. 7 import updates.

Q3: Wire NECK collar equip flow in DataDrivenBondageItem:
    - Target must be tied up (V1 rule preserved)
    - Distance + line-of-sight validation
    - Owner added to NBT before equip via CollarHelper.addOwner()
    - V2EquipmentHelper handles conflict resolution
    - ModSounds.COLLAR_PUT played on success
    - OwnershipComponent.onEquipped registers in CollarRegistry

src/main/java/com/tiedup/remake/entities/EntityMaster.java

@@ -1072,7 +1072,7 @@ public class EntityMaster extends EntityKidnapperElite {
                             if (
                                 tag != null &&
                                 tag.getBoolean(
-                                    com.tiedup.remake.state.HumanChairHelper.NBT_KEY
+                                    com.tiedup.remake.util.HumanChairHelper.NBT_KEY
                                 )
                             ) {
                                 bindState.unequip(BodyRegionV2.ARMS);

src/main/java/com/tiedup/remake/entities/ai/master/MasterHumanChairGoal.java

@@ -5,7 +5,7 @@ import com.tiedup.remake.dialogue.DialogueBridge;
 import com.tiedup.remake.entities.EntityMaster;
 import com.tiedup.remake.v2.bondage.datadriven.DataDrivenBondageItem;
 import net.minecraft.resources.ResourceLocation;
-import com.tiedup.remake.state.HumanChairHelper;
+import com.tiedup.remake.util.HumanChairHelper;
 import com.tiedup.remake.state.PlayerBindState;
 import com.tiedup.remake.v2.BodyRegionV2;
 import java.util.EnumSet;