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/@ungap/structured-clone/cjs/index.js

@@ -0,0 +1,27 @@
+'use strict';
+const {deserialize} = require('./deserialize.js');
+const {serialize} = require('./serialize.js');
+
+/**
+ * @typedef {Array<string,any>} Record a type representation
+ */
+
+/**
+ * Returns an array of serialized Records.
+ * @param {any} any a serializable value.
+ * @param {{transfer?: any[], json?: boolean, lossy?: boolean}?} options an object with
+ * a transfer option (ignored when polyfilled) and/or non standard fields that
+ * fallback to the polyfill if present.
+ * @returns {Record[]}
+ */
+Object.defineProperty(exports, '__esModule', {value: true}).default = typeof structuredClone === "function" ?
+  /* c8 ignore start */
+  (any, options) => (
+    options && ('json' in options || 'lossy' in options) ?
+      deserialize(serialize(any, options)) : structuredClone(any)
+  ) :
+  (any, options) => deserialize(serialize(any, options));
+  /* c8 ignore stop */
+
+exports.deserialize = deserialize;
+exports.serialize = serialize;