Close sql.Rows inline so sqlclosecheck can see it (refs #61)

The ten sqlclosecheck findings were not leaks: every one of these
queries already deferred a close through the package-local CloseRows
helper. sqlclosecheck only recognises a Close call on the rows value
in the function that produced it (directly deferred, or inside a
deferred closure), so a call that hands rows to a helper reads as
unhandled.

Rather than keep a helper the linter cannot see through, drop
CloseRows and defer a closure that calls rows.Close() directly at each
of the eighteen call sites, keeping the existing fatal-on-close-error
behaviour byte for byte. The close still runs exactly once, on
function exit, after the rows have been read.

Fatalf stays; it is still used by the transaction helpers.

internal/database/blobs.go

@@ -82,7 +82,13 @@ func (r *BlobRepository) GetAll(ctx context.Context) (map[string]*Blob, error) {
 	if err != nil {
 		return nil, fmt.Errorf("querying blobs: %w", err)
 	}
-	defer CloseRows(rows)
+
+	defer func() {
+		err := rows.Close()
+		if err != nil {
+			Fatalf("failed to close rows: %v", err)
+		}
+	}()
 
 	out := make(map[string]*Blob)