feat(psn): sync PlayStation titles in the library sync

Exact IGDB matches are added; unsure titles wait in a review import.
Playtime and last played come from PSN: summed per game, not editable.
PSN games give no Pile Points. Users with only a PSN link sync too
(V39 drops steam_id NOT NULL). Linking starts a sync, or schedules one
for the end of the cooldown. Inbox notes 2 days before the PSN link
ends and when it has ended.

src/main/resources/application.yml

@@ -56,6 +56,8 @@ app:
     token-key: ${APP_PSN_TOKEN_KEY:}
     auth-base-url: https://ca.account.sony.com/api/authz/v3/oauth
     api-base-url: https://m.np.playstation.com/api
+    # Days before the link ends that the inbox gets its "ends soon" note.
+    expiry-warning-days: 2
     # The public client of the PlayStation app, as the psn-api project ships it. Not a secret of ours.
     client-id: 09515159-7237-4370-9b40-3806e67c0891
     client-secret: ucPjka5tntB2KqsP