fix(archsetup): accept local-path repo specs in config validation

The `validate_config()` repo check I just added used a scheme allowlist (`http(s)://`, `git://`, `ssh://`, `user@host:path`), which rejected `ARCHSETUP_REPO=/tmp/archsetup-test` in `scripts/testing/archsetup-vm.conf`. That broke the VM test: archsetup exited during validation before logging anything, and `run-test.sh` reported "ArchSetup process not found after launch". `git clone` accepts local paths and `file://` URLs fine, so the allowlist was wrong. I replaced it with a security-only check: reject a leading dash (which `git` would parse as an option) plus whitespace and control characters, allow everything else. Smoke-tested against the test config and a matrix of repo forms.

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