build: update npm install command to use --legacy-peer-deps

This change modifies the build scripts to use --legacy-peer-deps flag when installing npm dependencies to resolve potential peer dependency conflicts during the build process. The change is applied to both bash (build.sh) and batch (build.bat) build scripts.

frontend/node_modules/eslint/messages/plugin-missing.js

@@ -1,9 +1,9 @@
 "use strict";
 
-module.exports = function (it) {
-	const { pluginName, resolvePluginsRelativeTo, importerName } = it;
+module.exports = function(it) {
+    const { pluginName, resolvePluginsRelativeTo, importerName } = it;
 
-	return `
+    return `
 ESLint couldn't find the plugin "${pluginName}".
 
 (The package "${pluginName}" was not found when loaded as a Node module from the directory "${resolvePluginsRelativeTo}".)
@@ -14,6 +14,6 @@ It's likely that the plugin isn't installed correctly. Try reinstalling by runni
 
 The plugin "${pluginName}" was referenced from the config file in "${importerName}".
 
-If you still can't figure out the problem, please see https://eslint.org/docs/latest/use/troubleshooting.
+If you still can't figure out the problem, please stop by https://eslint.org/chat/help to chat with the team.
 `.trimStart();
 };