[linkstack] Chart Update

[mvprowess]

Version path: 4.8.0 → 4.8.4

⚠️ License annotation bug: This chart currently declares MIT but LinkStack has been AGPL-3.0 since v4.0.0.

Changes required:

• Change artifacthub.io/license from MIT → AGPL-3.0
• Change org.opencontainers.image.licenses from MIT → AGPL-3.0
• Add blocks/ directory to PersistentVolume mounts in values (new modular blocks system)
• Add note to README/NOTES.txt: versions 4.8.0–4.8.3 contained a critical bug that permanently deleted the themes/ directory on each update run — 4.8.4 fixes this; also contained a critical file upload security vulnerability fixed in 4.8.4
• Bump appVersion and image digest to 4.8.4
• Bump chart version to 1.0.0