Initial VTuber Awards implementation

Backend/Contracts/AdminContracts.cs

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+namespace Backend.Contracts;
+
+public sealed record AdminMetricDto(string Label, int Value, string Note);
+
+public sealed record AdminActivityDto(string Label, string Age);
+
+public sealed record AdminTopCategoryDto(string Category, int Votes);
+
+public sealed record AdminDashboardResponse(
+    IEnumerable<AdminMetricDto> Metrics,
+    IEnumerable<AdminActivityDto> Activities,
+    IEnumerable<AdminTopCategoryDto> TopCategories);
+
+public sealed record AdminSeasonListItemDto(
+    int Id,
+    int Year,
+    string Name,
+    string CurrentPhase,
+    bool IsCurrent,
+    int CategoryCount);
+
+public sealed record AdminCategoryItemDto(
+    int Id,
+    string GroupName,
+    string Name,
+    string Slug,
+    string Description,
+    int SortOrder,
+    int MaxNomineesPerUser,
+    int CandidateCount);
+
+public sealed record AdminCandidateItemDto(
+    int Id,
+    int CategoryId,
+    string DisplayName,
+    string ChannelSlug,
+    string Platform);
+
+public sealed record AdminNominationReviewItemDto(
+    int Id,
+    int CategoryId,
+    string CategoryName,
+    string SubmittedByTwitchId,
+    string CandidateText,
+    DateTimeOffset CreatedAt);
+
+public sealed record AdminSeasonDetailResponse(
+    int Id,
+    int Year,
+    string Name,
+    string CurrentPhase,
+    bool IsCurrent,
+    IEnumerable<AdminCategoryItemDto> Categories,
+    IEnumerable<AdminCandidateItemDto> Candidates,
+    IEnumerable<AdminNominationReviewItemDto> PendingNominations);
+
+public sealed record UpdateSeasonRequest(
+    string CurrentPhase,
+    bool IsCurrent);
+
+public sealed record UpsertCategoryRequest(
+    string GroupName,
+    string Name,
+    string Slug,
+    string Description,
+    int SortOrder,
+    int MaxNomineesPerUser);
+
+public sealed record UpsertCandidateRequest(
+    int CategoryId,
+    string DisplayName,
+    string ChannelSlug,
+    string Platform);
+
+public sealed record ApproveNominationRequest(
+    string? DisplayName,
+    string? ChannelSlug,
+    string? Platform);

Backend/Contracts/AuthContracts.cs

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+namespace Backend.Contracts;
+
+public sealed record LoginRequest(
+    string TwitchUserId,
+    string DisplayName,
+    string Role);
+
+public sealed record AuthSessionDto(
+    string SessionToken,
+    string TwitchUserId,
+    string DisplayName,
+    string Role);

Backend/Contracts/PublicContracts.cs

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+namespace Backend.Contracts;
+
+public sealed record TimelineItem(
+    string Key,
+    string Title,
+    DateOnly StartsAt,
+    DateOnly EndsAt,
+    string State);
+
+public sealed record FeaturedCategoryDto(
+    int Id,
+    string GroupName,
+    string Name,
+    string Description,
+    int MaxNomineesPerUser);
+
+public sealed record WinnerPreviewDto(
+    int Year,
+    string Category,
+    string WinnerName,
+    string WinnerSlug);
+
+public sealed record FaqItemDto(string Question, string Answer);
+
+public sealed record OverviewResponse(
+    int SeasonId,
+    int Year,
+    string Title,
+    DateOnly ShowDate,
+    string CurrentPhase,
+    bool IsCommunityOnly,
+    string LoginProvider,
+    IEnumerable<TimelineItem> Timeline,
+    IEnumerable<FeaturedCategoryDto> FeaturedCategories,
+    IEnumerable<WinnerPreviewDto> WinnersPreview,
+    IEnumerable<FaqItemDto> Faq);
+
+public sealed record CandidateSummaryDto(
+    int Id,
+    string DisplayName,
+    string ChannelSlug,
+    string Platform);
+
+public sealed record PublicCategoryDetailDto(
+    int Id,
+    string Name,
+    string GroupName,
+    string Description,
+    int MaxNomineesPerUser,
+    IEnumerable<CandidateSummaryDto> Candidates);
+
+public sealed record SeasonCategoriesResponse(
+    int SeasonId,
+    int Year,
+    IEnumerable<PublicCategoryDetailDto> Categories);
+
+public sealed record WinnerArchiveItemDto(
+    string Category,
+    string WinnerName,
+    string WinnerSlug);
+
+public sealed record WinnerArchiveResponse(
+    int Year,
+    IEnumerable<WinnerArchiveItemDto> Items);
+
+public sealed record CreateNominationRequest(
+    int Year,
+    int CategoryId,
+    string TwitchUserId,
+    string[] Nominees);
+
+public sealed record VoteEntryRequest(
+    int CategoryId,
+    int CandidateId);
+
+public sealed record CreateVoteRequest(
+    int SeasonId,
+    string TwitchUserId,
+    VoteEntryRequest[] Entries);