Add event retention, purge, and catalogue routes

[tudddorrr]

• Add per-game, per-event retention configs that define how long events are kept.
• Run a daily scheduled task that deletes events (and their properties) past their retention period.
• Add an admin route to manually purge all events of a given name for a game.
• Add an event catalogue endpoint listing event names with counts, unique players, property keys, and retention days.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.47%. Comparing base (d473a34) to head (a1adef5).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1049      +/-   ##
===========================================
+ Coverage    98.45%   98.47%   +0.02%     
===========================================
  Files          477      485       +8     
  Lines         7618     7742     +124     
  Branches       996     1011      +15     
===========================================
+ Hits          7500     7624     +124     
  Misses          49       49              
  Partials        69       69              

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