style: apply gofmt across Go sources

Repo-wide gofmt sweep: const-block alignment, doc-comment spacing,
statement-after-brace fix in media.go, trailing blank lines. No
semantic changes — whitespace-insensitive diff is empty for every
file in this commit.

cmd/server/tests/collections_smart_test.go

@@ -111,7 +111,7 @@ func smartCreateLibraryAndBooks(t *testing.T, setup *TestServerSetup, userID uui
 		media, err := setup.DB.CreateMediaItem(ctx, database.CreateMediaItemParams{
 			LibraryID: pgtype.UUID{Bytes: libUUID, Valid: true},
 			Title:     title,
-			Authors:  []string{"Smart Rule Author"},
+			Authors:   []string{"Smart Rule Author"},
 			Genre:     pgtype.Text{String: genre, Valid: true},
 			FilePath:  fmt.Sprintf("/tmp/%s-%d.epub", title, time.Now().UnixNano()),
 			FileSize:  pgtype.Int8{Int64: 1024, Valid: true},