feat: implement user authentication and admin management

- Add user management API endpoints for listing and creating users.
- Implement login and logout functionality with rate limiting.
- Create UI components for login form, logout button, and animated elements.
- Add session management with JWT and secure cookie handling.
- Seed initial admin user if no users exist.
- Introduce utility functions for password hashing and user authentication.
- Set up proxy middleware for route protection and security headers.
- Create a JSON file for user data storage.
- Add links configuration for external resources.

frontend/app/components/SpotlightCard.tsx

@@ -0,0 +1,44 @@
+"use client";
+
+import { useRef } from "react";
+
+/**
+ * SpotlightCard — renders a card with a cursor-following radial glow
+ * that lights up where the user's mouse is hovering. Zero dependencies.
+ */
+export default function SpotlightCard({
+  children,
+  className = "",
+}: {
+  children: React.ReactNode;
+  className?: string;
+}) {
+  const ref = useRef<HTMLDivElement>(null);
+
+  function onMouseMove(e: React.MouseEvent<HTMLDivElement>) {
+    const el = ref.current;
+    if (!el) return;
+    const rect = el.getBoundingClientRect();
+    el.style.setProperty("--mx", `${e.clientX - rect.left}px`);
+    el.style.setProperty("--my", `${e.clientY - rect.top}px`);
+  }
+
+  function onMouseLeave() {
+    // Reset so the glow fades away gracefully
+    const el = ref.current;
+    if (!el) return;
+    el.style.setProperty("--mx", "-9999px");
+    el.style.setProperty("--my", "-9999px");
+  }
+
+  return (
+    <div
+      ref={ref}
+      className={`spotlight ${className}`}
+      onMouseMove={onMouseMove}
+      onMouseLeave={onMouseLeave}
+    >
+      {children}
+    </div>
+  );
+}