refactor: split MineCommands into separate command classes

src/main/java/com/loki/lomines/command/MaskCommands.java

@@ -0,0 +1,50 @@
+package com.loki.lomines.command;
+
+import com.loki.lomines.LoMinesPlugin;
+import com.loki.lomines.core.Mines;
+import com.loki.lomines.data.ConfigParseException;
+import dev.lolib.commands.annotation.Arg;
+import dev.lolib.commands.annotation.Command;
+import dev.lolib.commands.annotation.Subcommand;
+import dev.lolib.scheduler.Scheduler;
+import net.kyori.adventure.text.Component;
+import org.bukkit.command.CommandSender;
+
+import java.io.IOException;
+
+/**
+ * Mask commands for mine shape management.
+ * Provides commands for scanning and saving mask positions.
+ */
+@Command(value = "lm", permission = "lomines.use")
+public class MaskCommands {
+
+    private final LoMinesPlugin plugin;
+    private final Mines mines;
+
+    public MaskCommands(LoMinesPlugin plugin) {
+        this.plugin = plugin;
+        this.mines = plugin.getMines();
+    }
+
+    /**
+     * Scans selection for marker blocks ({@code mask.marker}, default pink concrete), saves mask positions and switches mine to mask fill mode.
+     * Run from the server main thread (scheduled automatically).
+     */
+    @Subcommand(value = "maskscan", permission = "lomines.admin.maskscan")
+    public void maskScan(CommandSender sender, @Arg("mine") String name) {
+        Scheduler.get(plugin).run(() -> {
+            try {
+                int n = mines.scanAndSaveMask(name);
+                sender.sendMessage(Component.text(
+                    "Mask mode: saved " + n + " cell(s) for mine '" + name
+                        + "'. Reset will spawn ore only at those positions."));
+            } catch (IllegalArgumentException e) {
+                sender.sendMessage(Component.text("Mine not found: " + name));
+            } catch (IOException | ConfigParseException e) {
+                sender.sendMessage(Component.text("Mask scan failed: " + e.getMessage()));
+                plugin.loLogger().error("maskscan failed for " + name, e);
+            }
+        });
+    }
+}