Introduces support for scanning and assigning the first free IP from a user-specified range, and expands advanced LXC container settings to include GPU passthrough, TUN/TAP, nesting, keyctl, mknod, timezone, protection, and APT cacher options. Refactors advanced_settings wizard to support these new features, updates variable handling and defaults, and improves summary and output formatting. Also enhances SSH key configuration, storage/template validation, and GPU passthrough logic.
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