Arti Atolye ERP - Stone Core v6 PATCH ONLY

Purpose:
- Adds an admin-only delete button to stone_detail.php for unused/test stone cards.

Changed file:
- stone_detail.php

No SQL import is required.

Rules:
- If the stone has no purchase lot and no stock movement, admin can hard delete it from the stone card detail page.
- If the stone has any purchase lot or stock movement, delete is blocked. Use Taş İşlemleri / Taş Düzeltmeleri instead.
- If a stone opening request was linked to the deleted test stone, the link is detached before deletion.

Install:
1. Upload this ZIP into public_html/erp.
2. Extract to /public_html/erp.
3. Approve overwrite.
4. Open the target stone card and use Admin İşlemleri > Bu Kullanılmamış Taş Kartını Sil.
