feat: add admin panel

src/beaver_gateway/frontends/admin/templates/login.html

@@ -0,0 +1,83 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>beaver-gateway · log in</title>
+  <style>
+    html, body { margin: 0; padding: 0; height: 100%; background: #fbfbfd; color: #1d1d1f; }
+    body {
+      font-family: -apple-system, "SF Pro Display", system-ui, sans-serif;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      min-height: 100vh;
+    }
+    .card {
+      background: #fff;
+      border: 1px solid #e5e5ea;
+      border-radius: 16px;
+      padding: 2rem 2.25rem;
+      width: min(360px, 92vw);
+      box-shadow: 0 10px 24px rgba(0,0,0,0.04);
+    }
+    h1 {
+      margin: 0 0 0.25rem;
+      font-size: 1.25rem;
+      font-weight: 600;
+      letter-spacing: -0.02em;
+    }
+    p.muted { color: #6e6e73; margin: 0 0 1.4rem; font-size: 0.92em; }
+    label { display: block; margin: 0.85rem 0 0.3rem; font-size: 0.82em; color: #6e6e73; }
+    input {
+      width: 100%;
+      padding: 0.6rem 0.75rem;
+      font-family: inherit;
+      font-size: 0.95em;
+      border: 1px solid #e5e5ea;
+      border-radius: 8px;
+      background: #fff;
+      box-sizing: border-box;
+    }
+    input:focus { outline: 2px solid #0071e3; outline-offset: 1px; }
+    button {
+      width: 100%;
+      margin-top: 1.25rem;
+      padding: 0.65rem;
+      font-family: inherit;
+      font-size: 0.95em;
+      background: #0071e3;
+      border: 1px solid #0071e3;
+      color: white;
+      border-radius: 8px;
+      cursor: pointer;
+    }
+    button:hover { background: #005bb5; }
+    .error {
+      background: #fff0f0;
+      border: 1px solid #f5c2c5;
+      color: #d70015;
+      padding: 0.65rem 0.85rem;
+      border-radius: 8px;
+      font-size: 0.9em;
+      margin-bottom: 1rem;
+    }
+  </style>
+</head>
+<body>
+  <div class="card">
+    <h1>beaver-gateway</h1>
+    <p class="muted">Sign in to manage tokens and view audit logs.</p>
+    {% if error %}
+      <div class="error">{{ error }}</div>
+    {% endif %}
+    <form method="post" action="/login">
+      <label for="username">Username</label>
+      <input id="username" name="username" type="text" autocomplete="username" required autofocus>
+      <label for="password">Password</label>
+      <input id="password" name="password" type="password" autocomplete="current-password" required>
+      <button type="submit">Sign in</button>
+    </form>
+  </div>
+</body>
+</html>