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/dev/loki/lomines/data/stats/LeaderboardEntry.java

@@ -0,0 +1,29 @@
+package dev.loki.lomines.data.stats;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * Immutable data class representing a single entry in the leaderboard.
+ * Contains a player's UUID and their block count.
+ */
+public record LeaderboardEntry(UUID playerId, long count) {
+
+    public LeaderboardEntry(UUID playerId, long count) {
+        this.playerId = Objects.requireNonNull(playerId, "playerId cannot be null");
+        this.count = count;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        LeaderboardEntry that = (LeaderboardEntry) o;
+        return count == that.count && playerId.equals(that.playerId);
+    }
+
+    @Override
+    public String toString() {
+        return "LeaderboardEntry{playerId=" + playerId + ", count=" + count + "}";
+    }
+}