Feature: Plugin system, site search, notifications, webhooks, caching & loading states

- Plugin/module system with registry, hooks for admin nav/permissions/i18n
- Example Games plugin demonstrating the plugin system
- Site-wide search with Cmd+K command palette (cmdk-based)
- Real-time notification system (SSE + Redis pub/sub)
- Extensible webhook system with admin management UI
- Caching strategy: tiered data cache (unstable_cache + Redis)
- Theme import/export as JSON
- Loading states (spinner/skeleton) for all public pages
- Mobile responsive fixes (admin dashboard, guilds page)
- Webhooks admin page under Settings hub

src/app/admin/theme/page.tsx

@@ -4,6 +4,7 @@ import {
 	applyCustomTheme,
 	applyPreset,
 	deleteCustomTheme,
+	importThemeJson,
 	saveCustomTheme,
 	saveTheme,
 } from "@/actions/admin-theme";
@@ -520,6 +521,30 @@ export default async function AdminTheme({
 				)}
 			</section>
 
+			<section className="mt-6">
+				<h2 className="admin-section-title">Import / Export</h2>
+				<p className="text-xs text-[var(--admin-text-muted)] mb-3">
+					Export your current theme as JSON to share or back up. Import a
+					previously exported JSON file to restore a theme.
+				</p>
+				<div className="flex flex-wrap gap-4">
+					<a href="/api/admin/theme/export" download className="btn btn-outline inline-flex items-center">
+						⬇ Export theme JSON
+					</a>
+					<form action={importThemeJson} className="flex flex-wrap items-center gap-2">
+						<textarea
+							name="theme_json"
+							placeholder="Paste theme JSON here..."
+							className="px-3 py-2 rounded-lg border bg-[var(--admin-canvas)] text-[var(--admin-text)] text-xs w-80 h-20 resize-none"
+							style={{ borderColor: "var(--admin-border)" }}
+						/>
+						<button type="submit" className="btn btn-primary">
+							Import theme
+						</button>
+					</form>
+				</div>
+			</section>
+
 			<form action={saveTheme}>
 				<h2 className="mt-6 text-lg font-extrabold">☀ Light mode</h2>
 				<p className="text-xs text-[var(--admin-text-muted)] mb-3 mt-1">