fix(clippy): allow large_enum_variant on DeltaCommitOutcome for Rust 1.93

Pre-existing in the delta-upload service: Rust 1.93's stricter large_enum_variant lint flags the FileDto-carrying Done variant (the sibling variant is tiny). The value is short-lived (one per commit), so silence the lint rather than box FileDto and complicate every call site. Keeps the CI clippy -D warnings gate green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/application/services/delta_upload_service.rs

@@ -135,6 +135,11 @@ enum CommitMode {
 }
 
 /// Outcome of a commit attempt.
+// `Done` carries a full `FileDto` (~297 B) while `StillMissing` is tiny; the
+// size gap trips `clippy::large_enum_variant` under Rust 1.93's stricter lint.
+// The value is short-lived (returned once per commit), so the gap isn't worth
+// boxing — silence the lint rather than complicate the call sites.
+#[allow(clippy::large_enum_variant)]
 pub enum DeltaCommitOutcome {
     /// The file row exists; `created` distinguishes 201 from 200.
     Done { file: FileDto, created: bool },