refactor: reorganize packages and replace LPSchematic with WorldEdit

Restructure core modules into subpackages (generator, schematic, config, session, etc.); add .schem/.nbt schematic pipeline, commands, adaptive stats skeleton, and bootstrap wiring.

src/main/java/dev/loki/loparkour/util/PagedMenu.java

@@ -1,46 +0,0 @@
-package dev.loki.loparkour.util;
-
-import org.bukkit.entity.Player;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Temporary stub for PagedMenu during migration
- */
-public class PagedMenu {
-    private final int rows;
-    private final String title;
-    private final List<MenuItem> items = new ArrayList<>();
-    
-    public PagedMenu(int rows, String title) {
-        this.rows = rows;
-        this.title = title;
-    }
-    
-    public PagedMenu addToDisplay(List<Item> items) {
-        return this;
-    }
-    
-    public PagedMenu item(int slot, Item item) {
-        return this;
-    }
-    
-    public PagedMenu nextPage(int slot, Item item) {
-        return this;
-    }
-    
-    public PagedMenu prevPage(int slot, Item item) {
-        return this;
-    }
-    
-    public void page(int direction) {
-    }
-    
-    public List<Object> getTotalToDisplay() {
-        return new ArrayList<>();
-    }
-    
-    public void open(Player player) {
-        player.sendMessage("§c" + title + " (" + rows + " рядов, " + items.size() + " пунктов) — меню временно недоступно.");
-    }
-}