Fix secret loading for socket message verification

[tudddorrr]

Socket request signing support

• socketLogger.ts: Updated logRequest to strip a leading signature line (separated by newline) before parsing the JSON body when conn.verifyRequests is enabled, so the logger correctly extracts the request name from signed messages.
• socketRouter.ts: Added eager population of game.apiSecret during socket connection validation, ensuring the API secret is available for verifying request signatures at the routing level.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.25%. Comparing base (3387ef9) to head (7613f8d).

Files with missing lines	Patch %	Lines
src/socket/messages/socketLogger.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1004      +/-   ##
===========================================
- Coverage    98.27%   98.25%   -0.02%     
===========================================
  Files          427      427              
  Lines         7110     7111       +1     
  Branches       964      965       +1     
===========================================
  Hits          6987     6987              
  Misses          50       50              
- Partials        73       74       +1     

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