[772424][PHP 8.1][PS 8.2] Fix PrettyBlocks upload – comply with open_basedir

[CySSoO]

[772424][PHP 8.1][PS 8.2] Fix PrettyBlocks upload – comply with open_basedir

Description

This PR fixes an image upload issue in the PrettyBlocks module on the 772424 server (PHP 8.1, PrestaShop 8.2, no overrides).

Issue

• Error open_basedir restriction in effect when calling move_uploaded_file().
• The generated destination path pointed to the filesystem root (/...) instead of an open_basedir-allowed directory.

Fix

• Force the upload destination inside the PrestaShop root (modules/prettyblocks/views/images/ by default).
• Normalize and secure paths (realpath(), block .., remove $/ prefix).
• Automatically create the target directory if missing.
• Preserve original logic (allowed file types, MD5 suffix in filename, upload error handling).

Tests

• ✅ Uploading valid images in PrettyBlocks → works, file is moved and public URL generated.
• ✅ Uploading disallowed file types → blocked with proper error message.
• ✅ Removing images → works without errors.
• ✅ Verified all paths remain under _PS_ROOT_DIR_ → compliant with open_basedir.

Impact

• No impact on PrestaShop core (no overrides).
• PrettyBlocks remains compatible with PHP 8.1 and PS 8.2.
• Reduces risk of path traversal (improved security).

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Notes:

• Ensure modules/prettyblocks/views/images/ is writable by www-data.
• This patch can be backported to other environments with active open_basedir.