FloraSelector Free 1.0.8 — security hardening

Changes:
- Climate CSV file uploads limited to 8 MB.
- Postcode import sources limited to 32 MB; ZIP entries to 200 and extracted dataset to 64 MB.
- Backup restoration limited to 100 MB uploaded ZIP, 2,000 entries, 160 MB aggregate uncompressed content, 16 MB options JSON, and 10 MB per image.
- Archive metadata checked before restoring options.

Upgrade over existing floraselector installation; do not delete the original plugin first. WordPress settings and user data are retained. PHP 8.4 runtime compatibility and security of the hosting PHP interpreter require separate verification.
