Add Elytra Parkour Mode (basic implementation)

- Created ElytraMode class with leaderboard support
- Auto-gives elytra and fireworks on mode start
- Added elytra mode config options
- Added Russian and English localization
- Integrated into mode selection menu
- TODO: Ring generation, boost system, collision detection

src/main/java/dev/loki/loparkour/mode/ElytraMode.java

@@ -0,0 +1,73 @@
+package dev.loki.loparkour.mode;
+
+import dev.loki.loparkour.config.Config;
+import dev.loki.loparkour.config.Locales;
+import dev.loki.loparkour.generator.ParkourGenerator;
+import dev.loki.loparkour.leaderboard.Leaderboard;
+import dev.loki.loparkour.player.ParkourPlayer;
+import dev.loki.loparkour.session.Session;
+import dev.efnilite.vilib.inventory.item.Item;
+import org.bukkit.GameMode;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Elytra Parkour Mode - Flying parkour with rings and boost
+ */
+public class ElytraMode implements Mode {
+
+    private final Leaderboard leaderboard = new Leaderboard(getName(), Leaderboard.Sort.SCORE);
+
+    @Override
+    @NotNull
+    public String getName() {
+        return "elytra";
+    }
+
+    @Override
+    @Nullable
+    public Item getItem(String locale) {
+        return Locales.getItem(locale, "modes.elytra");
+    }
+
+    @Override
+    @NotNull
+    public Leaderboard getLeaderboard() {
+        return leaderboard;
+    }
+
+    @Override
+    public void create(Player player) {
+        if (!Config.CONFIG.getBoolean("joining")) {
+            player.sendMessage("§cJoining is currently disabled.");
+            return;
+        }
+
+        ParkourPlayer pp = ParkourPlayer.getPlayer(player);
+        if (pp != null && pp.session.generator != null && pp.session.generator.getMode() instanceof ElytraMode) {
+            return;
+        }
+
+        player.closeInventory();
+
+        // Create session with elytra setup
+        Session.create(session -> {
+            ParkourGenerator generator = new ParkourGenerator(session);
+            
+            // Give elytra and fireworks to all players in session
+            for (ParkourPlayer parkourPlayer : session.getPlayers()) {
+                Player p = parkourPlayer.player;
+                p.setGameMode(GameMode.ADVENTURE);
+                p.getInventory().setChestplate(new ItemStack(Material.ELYTRA));
+                
+                int fireworks = Config.CONFIG.getInt("modes.elytra.starting-fireworks");
+                p.getInventory().addItem(new ItemStack(Material.FIREWORK_ROCKET, fireworks));
+            }
+            
+            return generator;
+        }, null, null, player);
+    }
+}