Fix Alice SD card (77% full, 3.2GB free)

[blackboxprogramming]

Node: Alice (.49) | Priority: High

Alice SD at 77% with only 3.2GB free. Main gateway node.

• Clean old logs, apt cache, unused packages
• Audit /opt/prism/ (empty, prism-pull timer pulling nothing)
• Consider offloading data to NFS/NVMe on Octavia