test(filename_audit): seed library 2 before its image_exif row (#151)

run_audit_skips_disabled_and_offline_libraries inserted an image_exif
row for library 2, which migrations never create, tripping the
image_exif.library_id foreign key. Insert the libraries row first so
the suite is green on master again.

Also fix the cmp_owned clippy warning in the filename_audit bin.

Closes #151

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/bin/filename_audit.rs

@@ -56,7 +56,7 @@ fn main() -> anyhow::Result<()> {
         && let base = PathBuf::from(base)
         && !libraries
             .iter()
-            .any(|l| PathBuf::from(&l.root_path) == base)
+            .any(|l| std::path::Path::new(&l.root_path) == base)
     {
         eprintln!(
             "note: BASE_PATH ({}) does not match any library root; auditing the library table",