Add owner role and admin management controls

Contracts/Dtos.cs

@@ -12,7 +12,7 @@ public record ResultsOpenRequest(bool ResultsOpen);
 
 public record VoteFinalizeRequest(bool Final);
 
-public record VoteStatusDto(Guid PlayerId, string Name, string Username, Phase Phase, bool Finalized, bool HasJoker, int SuggestionCount, IReadOnlyList<string> SuggestionTitles);
+public record VoteStatusDto(Guid PlayerId, string Name, string Username, Phase Phase, bool Finalized, bool HasJoker, bool IsAdmin, bool IsOwner, int SuggestionCount, IReadOnlyList<string> SuggestionTitles);
 
 public record LinkSuggestionsRequest(int SourceSuggestionId, int TargetSuggestionId);
 
@@ -21,5 +21,6 @@ public record UnlinkSuggestionsRequest(int SuggestionId);
 public record GrantJokerRequest(Guid PlayerId);
 
 public record SetPlayerPhaseRequest(Guid PlayerId, Phase Phase);
+public record SetPlayerAdminRequest(Guid PlayerId, bool IsAdmin);
 
 public record AdminPasswordRequest(string Password);

Contracts/Responses.cs

@@ -25,6 +25,7 @@ public record AdminResultsStateResponse(bool ResultsOpen, DateTimeOffset Updated
 public record AdminGrantJokerResponse(Guid Id, bool HasJoker);
 
 public record AdminSetPlayerPhaseResponse(Guid PlayerId, Phase CurrentPhase, bool VotesFinal);
+public record AdminSetPlayerAdminResponse(Guid PlayerId, bool IsAdmin);
 
 public record AdminDeletePlayerResponse(Guid DeletedPlayerId);
 
@@ -58,6 +59,7 @@ public record ResultItemDto(
 );
 
 public record AuthSessionResponse(Guid Id, string Username, string? DisplayName, bool IsAdmin);
+public record AuthOptionsResponse(bool OwnerExists);
 
 public record StateSummaryResponse(
     Phase CurrentPhase,
@@ -75,6 +77,7 @@ public record MeResponse(
     string Username,
     string? DisplayName,
     bool IsAdmin,
+    bool IsOwner,
     Phase CurrentPhase,
     bool VotesFinal,
     bool HasJoker