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.

docs/SCHEMATICS.md

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+# Parkour schematics (LoParkour)
+
+Jump structures are loaded from `plugins/LoParkour/schematics/` and matched to a **difficulty** in `plugins/LoParkour/schematics/schematics.yml`.
+
+## Supported file types
+
+| Extension | Source | Notes |
+|-----------|--------|--------|
+| `.nbt` | Vanilla structure block, `/structure save` | Pasted with Bukkit `StructureManager` |
+| `.schem`, `.schematic` | WorldEdit (`//copy`, `//schem save`) | Read via embedded WorldEdit clipboard IO |
+| `.lpschem` | **Legacy LoParkour format** | Not used in-game; convert with `/lp schematic convert` |
+
+During parkour generation, when the profile rolls **schematic** type, the plugin picks a random file whose `difficulty` in YAML is **≤** the player's schematic setting (0.0–1.0).
+
+## Difficulty keys (`schematics.yml`)
+
+```yaml
+difficulty:
+  d0e227d2: 0.25   # short id (recommended)
+```
+
+For file `parkour-d0e227d2.schem` you can use key `d0e227d2` or the full stem `parkour-d0e227d2`.
+
+Player setting **0.25 (easy)** → only structures with difficulty ≤ 0.25.  
+**1.0** → any structure.
+
+## Creating schematics in-game (admin)
+
+1. Get the wand: `/lp schematic wand`
+2. **Left-click** = position 1, **right-click** = position 2 (or use `/lp schematic pos1` / `pos2`)
+3. Save and register:
+   - `/lp create <difficulty>` — auto name `parkour-<hash>.schem` + YAML entry  
+   - `/lp schematic create <difficulty>` — same  
+   - `/lp schematic create <name> <difficulty>` — custom name (letters, numbers, `-`, `_`)
+
+Difficulty examples: `0.25`, `0.5`, `0.75`, `1.0` (must be between 0 and 1).
+
+4. `/lp schematic reload` — reload files without restart
+
+## Converting old `.lpschem` files
+
+Place `.lpschem` files in `plugins/LoParkour/schematics/` or legacy `schematics-new/`, then:
+
+```
+/lp schematic convert
+```
+
+Each file becomes `parkour-<id>.schem` in `schematics/` and gets a `difficulty:` entry (from the old metadata, or `0.5` if missing). Original `.lpschem` files are kept; delete them manually after checking.
+
+## Admin commands
+
+| Command | Description |
+|---------|-------------|
+| `/lp schematic wand` | Selection wand |
+| `/lp schematic pos1` / `pos2` | Set corners at your feet |
+| `/lp create <difficulty>` | Save selection → `.schem` + YAML |
+| `/lp schematic create <name> <difficulty>` | Save with custom name |
+| `/lp schematic convert` | Convert all `.lpschem` in schematics folders |
+| `/lp schematic list` | List loaded structures |
+| `/lp schematic paste <name>` | Test-paste at your location |
+| `/lp schematic reload` | Reload disk files |
+
+## Flow (runtime)
+
+```mermaid
+flowchart LR
+  A[BlockPlacer SCHEMATIC roll] --> B[SchematicManager.pick]
+  B --> C{Format}
+  C -->|nbt| D[Structure.place]
+  C -->|schem| E[Clipboard paste]
+  D --> F[Track blocks / score]
+  E --> F
+```
+
+## Folders
+
+- `plugins/LoParkour/schematics/` — `.nbt`, `.schem`, `.schematic` (active)
+- `plugins/LoParkour/schematics/schematics.yml` — difficulty map
+- `plugins/LoParkour/schematics-new/` — legacy; scanned only for `.lpschem` convert