Public Access
Achievements were fetched only when a game detail page was opened, and a Steam error was stored as "no achievements" or "hidden". A background run after each library sync now fetches schemas and the unlocks of games with new playtime, one Steam call per second for all runs together, and never overwrites stored data on a Steam error. Adds GET /api/library/achievements/summary, achievement counts on GameDto and the public profile, and migration V7 (playtime_at_refresh).