feat: Añadir soporte para autenticación de Discord y gestión de sesiones, incluyendo rutas de OAuth y almacenamiento de estado

src/server/views/pages/dashboard.ejs

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+<div class="max-w-6xl mx-auto p-4">
+  <div class="grid grid-cols-1 md:grid-cols-3 gap-6">
+    <!-- Card principal -->
+    <div class="col-span-2">
+      <div class="backdrop-blur-md bg-white/10 border border-white/10 rounded-xl p-6 shadow-lg glass-card">
+        <h1 class="text-3xl font-bold mb-2"><%= appName %></h1>
+        <p class="text-sm text-slate-200/80 mb-4">Panel de administración</p>
+        <div class="mt-4">
+          <label class="block text-xs text-slate-300 mb-2">Selecciona servidor</label>
+          <select id="guildSelector" class="w-full rounded-md p-3 bg-white/6 text-white focus:outline-none">
+            <% if (guilds && guilds.length) { %>
+              <% guilds.forEach(g => { %>
+                <option value="<%= g.id %>"><%= g.name %> (<%= g.id %>)</option>
+              <% }) %>
+            <% } else { %>
+              <option disabled>No tienes servidores gestionados</option>
+            <% } %>
+          </select>
+        </div>
+      </div>
+    </div>
+
+    <!-- Sidebar navegación móvil estilo app -->
+    <aside class="col-span-1 md:col-span-1">
+      <nav class="bg-white/6 backdrop-blur rounded-xl p-4 glass-card">
+        <ul class="flex md:flex-col gap-2">
+          <li><a href="/dashboard/overview" class="block p-2 rounded-md hover:bg-white/5">Overview</a></li>
+          <li><a href="/dashboard/members" class="block p-2 rounded-md hover:bg-white/5">Miembros</a></li>
+          <li><a href="/dashboard/settings" class="block p-2 rounded-md hover:bg-white/5">Ajustes</a></li>
+          <li><a href="/dashboard/areas" class="block p-2 rounded-md hover:bg-white/5">Game Areas</a></li>
+          <li><a href="/dashboard/mobs" class="block p-2 rounded-md hover:bg-white/5">Mobs</a></li>
+        </ul>
+      </nav>
+    </aside>
+  </div>
+</div>
+
+<script>
+  document.getElementById('guildSelector')?.addEventListener('change', (e) => {
+    const v = e.target.value;
+    if (v) window.location.href = `/dashboard/${v}/overview`;
+  });
+</script>

src/server/views/pages/login.ejs

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+<div class="min-h-screen flex items-center justify-center">
+  <div class="w-full max-w-md p-6 glass-card backdrop-blur-md rounded-xl">
+    <h2 class="text-2xl font-bold mb-4">Inicia sesión con Discord</h2>
+    <p class="text-sm mb-6">Para administrar servidores y usar el dashboard debes autenticarte con Discord.</p>
+    <a class="inline-block px-4 py-3 rounded-md bg-indigo-600 hover:bg-indigo-700 text-white" href="/auth/discord">Continuar con Discord</a>
+  </div>
+</div>

src/server/views/partials/dashboard_nav.ejs

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+<header class="w-full bg-transparent p-3 md:p-4 fixed top-0 left-0 right-0 z-20">
+  <div class="max-w-6xl mx-auto flex items-center justify-between">
+    <div class="flex items-center gap-3">
+      <a href="/" class="text-white font-bold">← Volver</a>
+      <span class="text-white/80">|</span>
+      <h3 class="text-white font-semibold"><%= appName %></h3>
+    </div>
+    <div class="flex items-center gap-3">
+      <% if (user) { %>
+        <div class="flex items-center gap-2">
+          <img src="<%= user.avatar || '/assets/images/snap1.svg' %>" class="w-8 h-8 rounded-full" alt="avatar">
+          <span class="text-white"><%= user.username %></span>
+        </div>
+        <a href="/auth/logout" class="text-sm text-white/70 px-3 py-2 rounded-md hover:bg-white/5">Salir</a>
+      <% } else { %>
+        <a href="/auth/discord" class="text-sm text-white/70 px-3 py-2 rounded-md hover:bg-white/5">Entrar</a>
+      <% } %>
+    </div>
+  </div>
+</header>
+
+<div style="height:56px"></div>