fix: never delete knockout matches that already have a result during sync

The stale-entry cleanup was deleting played matches when a team appeared
in a newly-scraped entry for the same round. Add AND score_ft_home IS NULL
so only unplayed placeholder entries are removed, not completed results.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/sync.ts

@@ -50,6 +50,7 @@ async function run() {
             AND round = ${round}
             AND group_name IS NULL
             AND is_quali_playoff = ${isQuali}
+            AND score_ft_home IS NULL
             AND (team1_id = ${team1Id} OR team2_id = ${team1Id} OR team1_id = ${team2Id} OR team2_id = ${team2Id})
             AND NOT (
               (team1_id = ${team1Id} AND team2_id = ${team2Id} AND date IS NOT DISTINCT FROM ${dateStr})
@@ -63,6 +64,7 @@ async function run() {
           AND round = ${round}
           AND group_name IS NULL
           AND is_quali_playoff = ${isQuali}
+          AND score_ft_home IS NULL
           AND (team1_id = ${team1Id} OR team2_id = ${team1Id} OR team1_id = ${team2Id} OR team2_id = ${team2Id})
           AND NOT (
             (team1_id = ${team1Id} AND team2_id = ${team2Id} AND date IS NOT DISTINCT FROM ${dateStr})