feat,refactor(core,backend,frontend): add simple frontend and a separate router for it

templates/base.html

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Disk Checker</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" 
+          rel="stylesheet">
+    <script src="https://unpkg.com/htmx.org@1.9.10"></script>
+    <link rel="stylesheet" href="/static/css/style.css">
+</head>
+<body>
+    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
+        <div class="container">
+            <a class="navbar-brand" href="/">Disk Checker</a>
+        </div>
+    </nav>
+   
+    <!--Available tools block, tools are loaded automatically-->
+    <div class="container">
+        {% block content %}{% endblock %}
+    </div>
+    
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
+</body>
+</html>