Fix Play button 404: bundle path and field name

- .jsdos bundles saved flat in data/games/ so /games/{id}.jsdos serves them
- bundleUrl() uses game.id (matches JSON) instead of game.slug (undefined)
- Delete handler also removes flat .jsdos bundle on game deletion

main.go

@@ -187,11 +187,11 @@ func handleGameByID(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, "Game not found", http.StatusNotFound)
 			return
 		}
-		// Remove the entire game directory
-		if err := os.RemoveAll(gameDir(g.ID)); err != nil {
-			http.Error(w, "Failed to delete game", http.StatusInternalServerError)
-			return
-		}
+		// Remove the game directory (game.json, cover, sockdrive files)
+		os.RemoveAll(gameDir(g.ID))
+		// Also remove the flat .jsdos bundle if it exists
+		bundlePath := filepath.Join(dataDir, "games", g.ID+".jsdos")
+		os.Remove(bundlePath)
 		writeJSON(w, http.StatusOK, map[string]string{"status": "deleted"})
 
 	default: