feat(stats): add PLATFORMS stat group and landing page statistics

Add PLATFORMS stat group to user stats: games and playtime per platform.
Add platforms, genres, and finished-per-year statistics to public stats
for the landing page.

readme.md

@@ -51,7 +51,7 @@ To Be Played is split into three repositories:
   groups it shows: totals and statuses; the pile (time to beat, weeks "at your pace" of the last 90 days, years of
   40-hour weeks, oldest unplayed game); most played and most loyal game (most months with playtime); top IGDB genres
   and moods; moon trips (Apollo 11, 195.3 h), longest day, share under one hour; finished games per year (from the
-  status history); the Pile of Shame trend (90 days of `backlog_snapshot`, plus "this month: added / done", where the
+  status history); games and playtime per platform (`PLATFORMS`: Steam games as "Steam", manual games by platform, trimmed and ignoring case, the most used spelling is the label); the Pile of Shame trend (90 days of `backlog_snapshot`, plus "this month: added / done", where the
   first sync of a Steam account is no "added", see `user_steam_sync.history_since`). Every number counts only listed games (still owned, not hidden: the view
   `listed_user_game`, V24).
 - **Status history**: a database trigger logs every status change of a library game in `user_game_status_change`
@@ -129,11 +129,11 @@ ArchUnit role rules (`RoleAnnotationRules`) and `src/test/resources/contract/aut
 | `POST` | `/api/library/sync` | JWT |
 | `POST` | `/api/library/broken-images` (`{appid, kind}`, kind `COVER` or `ACHIEVEMENT_ICONS`; `204`) | JWT |
 | `GET` | `/api/library/picker?maxMinutes=&mood=&count=&exclude=` | JWT |
-| `GET` | `/api/library/stats?groups=` (`OVERVIEW`, `PILE`, `TOP_GAMES`, `TASTE`, `HABITS`, `FINISHED`, `TREND`; none = all) | JWT |
+| `GET` | `/api/library/stats?groups=` (`OVERVIEW`, `PILE`, `TOP_GAMES`, `TASTE`, `HABITS`, `FINISHED`, `TREND`, `PLATFORMS`; none = all) | JWT |
 | `GET` | `/api/library/achievements/summary` | JWT |
 | `GET` | `/api/library/sync-status`, `/summary`, `/activity`, `/wishlist`, `/steam-profile`, `/games-count` | JWT |
 | `GET` | `/api/public/profiles/library` | profile ticket |
-| `GET` | `/api/stats/public` | public |
+| `GET` | `/api/stats/public` (+ games per platform, top genres, finished per year) | public |
 | `POST`, `PUT` | `/internal/accounts/deleted` (`{userIds}`; POST adds, PUT replaces the whole set; `204`) | service token |
 | `POST`, `PUT` | `/internal/accounts/states` (`{accounts: [{userId, steamId, blocked}]}`; POST updates, PUT replaces the whole set; `204`) | service token |
 | `POST` | `/internal/accounts/purge` (`{userIds}`), `/internal/accounts/prune` (`{knownUserIds}`, not empty) | service token |
@@ -180,7 +180,7 @@ flowchart LR
     Igdb -->|"OAuth token"| Twitch["Twitch"]
     Speedrun --> SpeedrunApi["speedrun.com API"]
     LibRepo --> Db[("PostgreSQL tbp_core")]
-    Stats -->|"listed_user_game, deleted_user, blocked_user"| Db
+    Stats -->|"listed_user_game, game_mood, user_game_status_change, deleted_user, blocked_user"| Db
     Auth -->|"service token<br/>/internal/accounts"| Account
     Account -->|"per-user rows, deleted_user, blocked_user, user_seen_at"| Db
 ```
@@ -196,7 +196,7 @@ flowchart LR
 | `speedrun_adapter` | speedrun.com client: game search by name, verified runs |
 
 **One shared schema.** All modules use one database `tbp_core`, and some read or write another module's tables in
-SQL, which ArchUnit cannot see: `stats` reads `listed_user_game`, `steam_game`, `deleted_user` and `blocked_user`; `account`
+SQL, which ArchUnit cannot see: `stats` reads `listed_user_game`, `steam_game`, `game_mood`, `user_game_status_change`, `deleted_user` and `blocked_user`; `account`
 deletes the per-user rows of the library tables (`AccountCleanupRepository`; a new library table with `user_id` goes
 into its list) and writes `user_seen_at` and `last_synced_at` of `user_steam_sync` (`AccountStateRepository`); `library`
 reads `deleted_user` and `blocked_user`. A module that moves to its own service takes these reads along as calls.