feat: Add user edit modal and user management pages

- Implemented user edit modal in user_edit.html for editing user details.
- Updated sidebar.html to correctly reflect active states for Users and Settings.
- Created table-07.html for displaying user data in a structured format.
- Added settings.html for managing email content and configurations.
- Developed users.html for listing all users with functionality to add and edit users.

api/users/info.php

@@ -0,0 +1,33 @@
+<?php
+require "../api.php";
+
+$api = new spamhasiApi();
+
+if (!$api->checkAuth()) {
+    die('{"status":500, "error":"Unauthorized"}');
+}
+
+if (!isset($_POST["id"])) {
+    die('{"status":500, "error":"Missing parameter"}');
+}
+
+$id = intval($_POST["id"]);
+
+$db = $api->getDB();
+
+$sql = "SELECT id, username FROM users WHERE id = :id";
+$stmt = $db->prepare($sql);
+$stmt->execute([':id' => $id]);
+
+$result = $stmt->fetch(PDO::FETCH_ASSOC);
+
+if ($result) {
+    $json["user"] = $result;
+    $json["status"] = 200; 
+}else{
+    $json["status"] = 500;
+    $json["error"] = "Empty SQL Result";
+}
+
+die(json_encode($json));
+?>