Update modpack to Minecraft 26.1.2 and add server-side datapack sync

- Update Minecraft version from **26.1.1** to **26.1.2**
- Add **LambDynamicLights** mod for dynamic lighting effects
- Update **Appleskin** mod compatibility for 26.1.2
- Add CLIENT-side mod export configuration for server pack
- Document datapack synchronization tasks for server deployment
- Move recipe tuning TODO to a dedicated **Datapacks** section

bash/export-serverpack.sh

@@ -11,6 +11,8 @@ TARGET_DIR="/home/dimti/Seafile/minecraft/installers/m2612"
 
 cd "${REPO_ROOT}" || exit 1
 
+# Side CLIENT-модов, нужных на сервере: pakku cfg prj -s BOTH lambdynamiclights xaeros-world-map
+# (один раз; пишет override в pakku.json, дальше export подхватывает сам)
 pakku export
 
 # Проверяем, существует ли архив