加后台登录、图片预览发送、自动清理上传文件

templates/admin_login.html

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+<!DOCTYPE html>
+<html lang="zh">
+<head>
+<meta charset="UTF-8">
+<title>登录 - 客服后台</title>
+<style>
+body{font-family:sans-serif;background:#f0f2f5;display:flex;align-items:center;justify-content:center;height:100vh;margin:0;}
+.box{background:#fff;padding:40px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,0.1);width:320px;}
+h2{text-align:center;color:#18479c;margin-bottom:24px;}
+input{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;margin-bottom:12px;font-size:14px;box-sizing:border-box;}
+button{width:100%;padding:10px;background:#2978e8;color:#fff;border:none;border-radius:6px;font-size:14px;cursor:pointer;}
+.err{color:#dc2626;font-size:13px;text-align:center;display:none;}
+</style>
+</head>
+<body>
+<div class="box">
+  <h2>🔒 后台登录</h2>
+  <input type="password" id="pwd" placeholder="请输入密码">
+  <p class="err" id="err">密码错误</p>
+  <button onclick="login()">登录</button>
+</div>
+<script>
+function login(){
+  var p=document.getElementById("pwd").value;
+  fetch("/admin/login",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({password:p})})
+  .then(function(r){if(r.ok){location.href="/admin/dashboard"}else{document.getElementById("err").style.display="block"}});
+}
+document.getElementById("pwd").addEventListener("keydown",function(e){if(e.key==="Enter")login()});
+</script>
+</body>
+</html>