added web and fix some problems

web/js/security.js

@@ -0,0 +1,8 @@
+const hashPassword = async (password) => {
+    const encoder = new TextEncoder()
+    const data = encoder.encode(password)
+    const hashBuffer = await crypto.subtle.digest('SHA-256', data)
+    const hashArray = Array.from(new Uint8Array(hashBuffer))
+    const hashHex = hashArray.map(b=>('00' + b.toString(16)).slice(-2)).join('')
+    return hashHex
+}