Debian server cleaned & optimized:
- Removed 2 old kernels, cleared 21GB uv cache
- journald: 500M/7day limit
- vm.swappiness=10, vm.vfs_cache_pressure=50
- NVMe scheduler=none (udev rule)
- Removed orphan docker volumes (open-terminal, scraper-data)
- Persist at /etc/sysctl.d/99-server-optimizations.conf + /etc/udev/rules.d/60-iosched.rules