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/lib/shared/ast-utils.js

@@ -8,8 +8,7 @@
  */
 "use strict";
 
-const breakableTypePattern =
-	/^(?:(?:Do)?While|For(?:In|Of)?|Switch)Statement$/u;
+const breakableTypePattern = /^(?:(?:Do)?While|For(?:In|Of)?|Switch)Statement$/u;
 const lineBreakPattern = /\r\n|[\r\n\u2028\u2029]/u;
 const shebangPattern = /^#!([^\r\n]+)/u;
 
@@ -19,12 +18,12 @@ const shebangPattern = /^#!([^\r\n]+)/u;
  * @returns {RegExp} A global regular expression that matches line terminators
  */
 function createGlobalLinebreakMatcher() {
-	return new RegExp(lineBreakPattern.source, "gu");
+    return new RegExp(lineBreakPattern.source, "gu");
 }
 
 module.exports = {
-	breakableTypePattern,
-	lineBreakPattern,
-	createGlobalLinebreakMatcher,
-	shebangPattern,
+    breakableTypePattern,
+    lineBreakPattern,
+    createGlobalLinebreakMatcher,
+    shebangPattern
 };