fix: honor RUSTIC_HOME and XDG config precedence - #1867
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Summary
Aligns profile discovery with the documented precedence: an absolute RUSTIC_HOME config directory first, then XDG_CONFIG_HOME and XDG_CONFIG_DIRS, followed by platform defaults. On Windows it also checks USERPROFILE/.config/rustic. Relative environment entries are ignored.
This PR is the implementation for #859; the same shared resolver is submitted separately for the related config-path issues.
Validation
cargo fmt --checkcargo test --locked --lib config::tests::git diff --checkFixes #859.