refactor(frontend): 不必要なconsole.logを除去・抑制 (#13400)

* refactor(frontend): 不必要なconsole.logを除去

* Update MkCode.core.vue

* Update game.board.vue

packages/frontend/src/components/MkCode.core.vue

@@ -52,7 +52,7 @@ async function fetchLanguage(to: string): Promise<void> {
 			return bundle.id === language || bundle.aliases?.includes(language);
 		});
 		if (bundles.length > 0) {
-			console.log(`Loading language: ${language}`);
+			if (_DEV_) console.log(`Loading language: ${language}`);
 			await highlighter.loadLanguage(bundles[0].import);
 			codeLang.value = language;
 		} else {