Remove integration soft delete and cascade hard delete to events

[tudddorrr]

Soft delete removal

• Integrations are now hard-deleted instead of soft-deleted: the deletedAt column and the default query filter that hid soft-deleted rows are gone, and the delete route removes the row outright.

Event cascade cleanup

• Steamworks, Game Center, and Google Play Games integration events now cascade on delete, so request logs are removed together with their integration instead of orphaned.

Data migration

• A migration re-creates the event foreign keys with ON DELETE CASCADE, purges existing soft-deleted integrations (cascading to their events), then drops deleted_at.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.42%. Comparing base (4a8cc5c) to head (5bad515).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1046      +/-   ##
===========================================
- Coverage    98.42%   98.42%   -0.01%     
===========================================
  Files          477      477              
  Lines         7614     7613       -1     
  Branches       999      999              
===========================================
- Hits          7494     7493       -1     
  Misses          49       49              
  Partials        71       71              

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