feat(datapacks): add ironchest recipes and datapack sync automation

- Add crafting recipes for copper, iron, gold, and diamond chests using IronChest mod
- Remove vanilla copper chest recipe to prevent conflicts
- Introduce `.env.example` for local world configuration
- Add `bash/sync-datapacks-to-world.sh` script to mirror datapacks to Minecraft world saves
  - Supports one-time sync and watch mode for real-time updates
  - Uses `rsync` for efficient file synchronization

.env.example

@@ -0,0 +1,2 @@
+# Локальный мир для синхронизации datapacks (bash/sync-datapacks-to-world.sh)
+LOCAL_WORLD="Новый мир"

bash/sync-datapacks-to-world.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+#
+# Зеркальная синхронизация ./datapacks → ./saves/$LOCAL_WORLD/datapacks
+# LOCAL_WORLD берётся из .env (см. .env.example).
+#
+# Использование:
+#   bash/sync-datapacks-to-world.sh          # один раз
+#   bash/sync-datapacks-to-world.sh --watch  # следить за изменениями
+#
+set -euo pipefail
+
+SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
+REPO_ROOT="${SCRIPT_DIR}/.."
+ENV_FILE="${REPO_ROOT}/.env"
+DATAPACKS_SRC="${REPO_ROOT}/datapacks/"
+
+if [[ -f "${ENV_FILE}" ]]; then
+    set -a
+    # shellcheck disable=SC1090
+    source "${ENV_FILE}"
+    set +a
+fi
+
+LOCAL_WORLD="${LOCAL_WORLD:-Новый мир}"
+DATAPACKS_DST="${REPO_ROOT}/saves/${LOCAL_WORLD}/datapacks/"
+
+sync_once() {
+    if [[ ! -d "${DATAPACKS_SRC}" ]]; then
+        echo "Ошибка: не найдена папка ${DATAPACKS_SRC}"
+        exit 1
+    fi
+
+    mkdir -p "${DATAPACKS_DST}"
+    echo "[$(date '+%H:%M:%S')] ${DATAPACKS_SRC} → ${DATAPACKS_DST}"
+    rsync -a --delete "${DATAPACKS_SRC}" "${DATAPACKS_DST}"
+    echo "[$(date '+%H:%M:%S')] готово"
+}
+
+watch_mode() {
+    if ! command -v inotifywait &> /dev/null; then
+        echo "Ошибка: inotifywait не найден (пакет inotify-tools)"
+        exit 1
+    fi
+
+    sync_once
+    echo "Watching ${DATAPACKS_SRC} for changes..."
+
+    while inotifywait -r -e modify,create,delete,move "${DATAPACKS_SRC}" &> /dev/null; do
+        sync_once
+    done
+}
+
+case "${1:-}" in
+    --watch|-w)
+        watch_mode
+        ;;
+    --help|-h)
+        echo "Usage: $(basename "$0") [--watch]"
+        ;;
+    "")
+        sync_once
+        ;;
+    *)
+        echo "Неизвестный аргумент: $1"
+        exit 1
+        ;;
+esac

datapacks/m2621/data/ironchest/recipe/copper_chest.json

@@ -0,0 +1,15 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "pattern": [
+    "III",
+    "ISI",
+    "III"
+  ],
+  "key": {
+    "I": "minecraft:copper_ingot",
+    "S": "minecraft:chest"
+  },
+  "result": {
+    "id": "ironchest:copper_chest"
+  }
+}

datapacks/m2621/data/ironchest/recipe/diamond_chest.json

@@ -0,0 +1,15 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "pattern": [
+    "III",
+    "ISI",
+    "III"
+  ],
+  "key": {
+    "I": "minecraft:diamond",
+    "S": "ironchest:gold_chest"
+  },
+  "result": {
+    "id": "ironchest:diamond_chest"
+  }
+}

datapacks/m2621/data/ironchest/recipe/gold_chest.json

@@ -0,0 +1,15 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "pattern": [
+    "III",
+    "ISI",
+    "III"
+  ],
+  "key": {
+    "I": "minecraft:gold_ingot",
+    "S": "ironchest:iron_chest"
+  },
+  "result": {
+    "id": "ironchest:gold_chest"
+  }
+}

datapacks/m2621/data/ironchest/recipe/iron_chest.json

@@ -0,0 +1,15 @@
+{
+  "type": "minecraft:crafting_shaped",
+  "pattern": [
+    "III",
+    "ISI",
+    "III"
+  ],
+  "key": {
+    "I": "minecraft:iron_ingot",
+    "S": "ironchest:copper_chest"
+  },
+  "result": {
+    "id": "ironchest:iron_chest"
+  }
+}

datapacks/m2621/data/minecraft/recipe/copper_chest.json

@@ -1,7 +1,5 @@
 {
   "type": "minecraft:crafting_shapeless",
-  "ingredients": [
-    "minecraft:copper_ingot"
-  ],
-  "result": {"id": "minecraft:copper_chest", "count": 0}
+  "ingredients": [],
+  "result": {"item": "minecraft:air", "count": 0}
 }