refactor: wire validate_config into the unattended install path

validate_config in lib/config.sh was unreachable from main(). Its empty-field checks duplicated four lines in gather_input's unattended branch. validate_config also has two checks gather_input doesn't: that every entry in SELECTED_DISKS is a real block device, and that TIMEZONE exists under /usr/share/zoneinfo. Neither check ever ran. A config with a typo'd disk path slipped past gather_input and surfaced as an obscure sgdisk error inside the destructive partitioning step.

I wired validate_config into main() after validate_filesystem, gated on UNATTENDED so it only runs against an already-loaded config. I dropped the four duplicate empty-field checks from gather_input's unattended branch. The filesystem-specific passphrase checks stay there because they're coupled to the FILESYSTEM branch logic.

validate_config reports every missing field at once instead of dying on the first. A config with five missing fields tells you all five in one pass.

I removed the four corresponding gather_input bats tests. validate_config's existing unit tests in test_config.bats already cover their assertions. Bats: 178 → 174.

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