Add AFK account and session overview (Refs #151)

src/routes/api/afk/+server.ts

@@ -0,0 +1,13 @@
+import { error, json } from '@sveltejs/kit';
+import { readAfkQuery } from '$lib/afk.js';
+import { afkOverview } from '$lib/server/fleet/afk-overview.js';
+
+export function GET({ url }: { url: URL }) {
+    let query;
+    try {
+        query = readAfkQuery(url.searchParams);
+    } catch (cause) {
+        error(400, cause instanceof Error ? cause.message : 'Invalid AFK filters.');
+    }
+    return json(afkOverview(query), { headers: { 'Cache-Control': 'no-store' } });
+}