Support multiple integrations of the same type per game

[tudddorrr]

Entity model

• SteamworksLeaderboardMapping composite primary key now includes integration_id, so the same Talo leaderboard can map to different Steamworks leaderboards across integrations.
• SteamworksLeaderboardEntry FK and unique constraint widened to include integration_id.
• SteamworksPlayerStat gains an integration FK with a unique constraint on (integration_id, player_stat_id) replacing the old player_stat_id unique.
• Two migrations backfill integration_id from the game's existing Steamworks integration, then enforce NOT NULL.

Duplicate detection

• Creating or updating an integration now checks whether another integration of the same type already points at the same external app identity (appId, clientId, or bundleId).
• Different apps of the same type are allowed; same app is rejected with a descriptive error.

Player resolution

• PlayerAlias.resolveIdentifier loads all integrations of the matching type (newest first) and tries each until one succeeds, so a ticket valid against one app is accepted even when other integrations exist.
• Integration.getPlayerIdentifier now returns a uniform { identifier, initialPlayerProps } shape instead of a union of per-service result types.

Integration triggering

• triggerIntegrations runs integrations sequentially instead of Promise.all and catches per-integration errors, so one failing integration no longer blocks the rest.

Cleanup tasks

• cleanupSteamworksLeaderboardEntries and cleanupSteamworksPlayerStats populate and follow the direct integration relation instead of resolving it through game lookups, simplifying the logic and removing orphan-handling fallbacks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.43%. Comparing base (93ffea9) to head (704cd42).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1048      +/-   ##
===========================================
+ Coverage    98.42%   98.43%   +0.01%     
===========================================
  Files          477      477              
  Lines         7613     7618       +5     
  Branches       999      996       -3     
===========================================
+ Hits          7493     7499       +6     
  Misses          49       49              
+ Partials        71       70       -1     

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