Lobby: include HostUserId in GameStateDto and let client derive host status; update tests
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Merge pull request 'Tech-Debt-Cleanup: Doku, Security-Hardening, Server-Validierung, Client-Stabilitaet' (#2) from feature/techdebt-cleanup into master
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Tech-Debt-Cleanup: Doku, Security-Hardening, Server-Validierung, Client-Stabilitaet
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