feat(auth): implement user authentication system

backend/node_modules/bcryptjs/bin/bcrypt

@@ -0,0 +1,23 @@
+#!/usr/bin/env node
+
+import path from "node:path";
+import bcrypt from "../index.js";
+
+if (process.argv.length < 3) {
+  console.log(
+    "Usage: " + path.basename(process.argv[1]) + " <input> [rounds|salt]",
+  );
+  process.exit(1);
+} else {
+  var salt;
+  if (process.argv.length > 3) {
+    salt = process.argv[3];
+    var rounds = parseInt(salt, 10);
+    if (rounds == salt) {
+      salt = bcrypt.genSaltSync(rounds);
+    }
+  } else {
+    salt = bcrypt.genSaltSync();
+  }
+  console.log(bcrypt.hashSync(process.argv[2], salt));
+}