chore: update .gitignore and build.gradle.kts for local server testing

- Added entries to .gitignore for local Paper test server and API documentation.
- Included the run-paper plugin in build.gradle.kts for local server execution.
- Configured runServer task with Minecraft version 1.21.4 for testing.

src/main/java/com/loki/lochat/api/service/PunishmentService.java

@@ -0,0 +1,38 @@
+package com.loki.lochat.api.service;
+
+import com.loki.lochat.data.model.BanRecord;
+import com.loki.lochat.data.model.WarnEntry;
+import net.kyori.adventure.text.Component;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Варны и баны LoChat
+ */
+public interface PunishmentService {
+
+    void addWarn(UUID uuid, String playerName, String moderator, String reason, boolean silent);
+
+    List<WarnEntry> getWarns(UUID uuid);
+
+    int getWarnCount(UUID uuid);
+
+    /**
+     * @param durationMs длительность; 0 = навсегда
+     */
+    void ban(UUID uuid, String playerName, long durationMs, String reason, String bannedBy);
+
+    boolean unban(UUID uuid);
+
+    boolean isBanned(UUID uuid);
+
+    BanRecord getActiveBan(UUID uuid);
+
+    /** Сообщение при кике (MiniMessage + legacy &#) */
+    Component buildBanKickMessage(BanRecord ban);
+
+    void save();
+
+    void reload();
+}