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/queue_test.go

@@ -51,7 +51,7 @@ func createTestQueueItem(t *testing.T, db *database.Queries, userID uuid.UUID) (
 	mediaItem, err := db.CreateMediaItem(ctx, database.CreateMediaItemParams{
 		LibraryID: library.ID,
 		Title:     "Test Book for Queue",
-		Authors:  []string{"Test Author"},
+		Authors:   []string{"Test Author"},
 		FilePath:  "/tmp/test.epub",
 		FileSize:  pgtype.Int8{Int64: 1024, Valid: true},
 		MimeType:  pgtype.Text{String: "application/epub+zip", Valid: true},