refactor: migrate package from com.loki to dev.loki

- Change base package from com.loki to dev.loki across all Java files
- Update plugin.yml main class path
- Fix ConfigParseException imports in test files
- Update build.gradle.kts relocate patterns
- Add missing imports in ConfigLoaderTest.java
- Update TODO.md with current status

BREAKING CHANGE: Package namespace changed from com.loki to dev.loki

src/main/java/com/loki/lomines/block/BlockSetter.java

@@ -1,37 +0,0 @@
-package com.loki.lomines.block;
-
-import com.loki.lomines.util.Cuboid;
-import org.bukkit.Location;
-
-import java.util.List;
-import java.util.function.IntConsumer;
-
-/**
- * Abstract base class for block setting strategies.
- * Provides a template for filling mine regions with blocks.
- * 
- * <p>Implementations:</p>
- * <ul>
- *   <li>BukkitBlockSetter - For vanilla Minecraft blocks</li>
- *   <li>OraxenBlockSetter - For Oraxen custom blocks</li>
- *   <li>ItemsAdderBlockSetter - For ItemsAdder custom blocks</li>
- * </ul>
- * 
- * <p>This is a placeholder that will be fully implemented in task 2.7.</p>
- */
-public abstract class BlockSetter {
-    
-    /**
-     * Fills a cuboid region with blocks asynchronously.
-     * The callback is invoked in the main thread after completion.
-     * 
-     * @param region The region to fill
-     * @param callback Called with the number of blocks set when complete
-     */
-    public abstract void fill(Cuboid region, IntConsumer callback);
-    
-    /**
-     * Places random weighted blocks only at the given locations (mask mode).
-     */
-    public abstract void fillAtLocations(List<Location> locations, IntConsumer callback);
-}