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/schematic/registry/Schematics.java

@@ -0,0 +1,35 @@
+package dev.loki.loparkour.schematic.registry;
+
+import dev.loki.loparkour.LoParkour;
+import dev.loki.loparkour.schematic.core.SchematicManager;
+import dev.lolib.scheduler.Scheduler;
+
+import java.io.File;
+
+/**
+ * Ensures the schematics folder exists; structures are loaded by {@link SchematicManager}.
+ */
+public class Schematics {
+
+    private static final File FOLDER = LoParkour.getInFolder("schematics");
+
+    public static void init() {
+        Scheduler.get(LoParkour.getPlugin()).runAsync(() -> {
+            if (!FOLDER.exists()) {
+                FOLDER.mkdirs();
+            }
+
+            File[] files = FOLDER.listFiles((dir, name) -> {
+                String lower = name.toLowerCase();
+                return lower.endsWith(".nbt") || lower.endsWith(".schem") || lower.endsWith(".schematic");
+            });
+
+            if (files == null || files.length == 0) {
+                LoParkour.log("No .nbt / .schem files in " + FOLDER.getAbsolutePath());
+                return;
+            }
+
+            LoParkour.log("Found " + files.length + " schematic file(s) in schematics/");
+        });
+    }
+}