feat: implement PocketBase database schema setup script and core API service for content management

src/lib/db.js

@@ -205,7 +205,8 @@ export async function setLearnDone(userId, weekNumber) {
 // ── Leaderboard ───────────────────────────────────────────────────────────────
 
 export async function getLeaderboard() {
-  return pb.collection('leaderboard').getFullList({ sort: '-points' });
+  const entries = await pb.collection('leaderboard').getFullList();
+  return entries.sort((a, b) => (b.points || 0) - (a.points || 0));
 }
 
 export async function upsertLeaderboardEntry(userId, name, pointsDelta, testsCompletedDelta = 0) {