Add Holograms integration and Sub-GUI editors

Holograms:
- HologramManager with auto-detection of HolographicDisplays/DecentHolograms
- HologramProvider interface and implementations
- HologramConfig for per-mine configuration
- /lm hologram <mine> [on|off] command
- Updates every second showing mine name, fill %, progress bar, and timer

Sub-GUI Editors:
- BlocksGui - edit block weights with +/- clicks
- BlockMaterialSelectionGui - paginated material picker
- ResetGui - configure reset interval, percent trigger, message, commands
- RewardsGui - manage reward entries
- All holders moved to gui/mine/holder/
- Editors moved to gui/mine/edit/
- Main GUI (MineEditGui) moved to gui/mine/main/

Package structure reorganized to maintain max 6 files per folder.

src/main/java/dev/loki/lomines/LoMinesPlugin.java

@@ -4,6 +4,7 @@ import dev.loki.lomines.core.mine.MineTicker;
 import dev.loki.lomines.core.mine.Mines;
 import dev.loki.lomines.data.stats.StatsManager;
 import dev.loki.lomines.integration.IntegrationManager;
+import dev.loki.lomines.integration.hologram.HologramManager;
 import dev.loki.lomines.wand.WandParticleService;
 import dev.loki.lomines.wand.group.GroupWandManager;
 import dev.lolib.commands.CommandManager;
@@ -23,6 +24,7 @@ public final class LoMinesPlugin extends LoPlugin {
     private CommandManager commandManager;
     private IntegrationManager integrationManager;
     private WandParticleService wandParticleService;
+    private HologramManager hologramManager;
 
     @Override
     protected void enable() {
@@ -39,6 +41,7 @@ public final class LoMinesPlugin extends LoPlugin {
             this.commandManager = components.commandManager();
             this.integrationManager = components.integrationManager();
             this.wandParticleService = new WandParticleService(this);
+            this.hologramManager = new HologramManager(this);
 
             initializer.loadMines(mines);
             this.mineTicker = initializer.startTicker(mines);
@@ -85,6 +88,10 @@ public final class LoMinesPlugin extends LoPlugin {
                 wandParticleService.stopAll();
             }
 
+            if (hologramManager != null) {
+                hologramManager.shutdown();
+            }
+
             loLogger().info("LoMines has been disabled!");
         } catch (Exception e) {
             loLogger().error("Error during plugin shutdown: " + e.getMessage());
@@ -122,4 +129,8 @@ public final class LoMinesPlugin extends LoPlugin {
     public WandParticleService getWandParticleService() {
         return wandParticleService;
     }
+
+    public HologramManager getHologramManager() {
+        return hologramManager;
+    }
 }