feat: Add web admin page for quest management and refactor Discord bot's quest UI to use new components.

web/src/App.tsx

@@ -2,6 +2,7 @@ import { BrowserRouter, Routes, Route } from "react-router-dom";
 import "./index.css";
 import { Dashboard } from "./pages/Dashboard";
 import { DesignSystem } from "./pages/DesignSystem";
+import { AdminQuests } from "./pages/AdminQuests";
 import { Home } from "./pages/Home";
 import { Toaster } from "sonner";
 
@@ -12,6 +13,7 @@ export function App() {
       <Routes>
         <Route path="/dashboard" element={<Dashboard />} />
         <Route path="/design-system" element={<DesignSystem />} />
+        <Route path="/admin/quests" element={<AdminQuests />} />
         <Route path="/" element={<Home />} />
       </Routes>
     </BrowserRouter>