feat: Initial commit for DorkNet Admin Mobile app

- Implemented main application structure using .NET MAUI.
- Added App class to manage navigation between Login and Admin pages.
- Created AppDesign class for consistent UI styling.
- Developed pages: LoginPage, DashboardPage, PlayersPage, RoomsPage, SettingsPage, and AdminTabbedPage.
- Integrated AdminApiClient for API interactions and SecureAdminSettings for secure storage of sensitive data.
- Configured Android and iOS platform-specific files including manifest and app delegate.
- Added README with build instructions and authentication details.

DorkNet.AdminMobile/Models/AdminModels.cs

@@ -0,0 +1,114 @@
+using System.Text.Json.Serialization;
+
+namespace DorkNet.AdminMobile.Models;
+
+public sealed class AdminLoginResponse
+{
+    [JsonPropertyName("access_token")]
+    public string AccessToken { get; set; } = string.Empty;
+
+    [JsonPropertyName("refresh_token")]
+    public string RefreshToken { get; set; } = string.Empty;
+
+    [JsonPropertyName("account_id")]
+    public long AccountId { get; set; }
+
+    [JsonPropertyName("username")]
+    public string Username { get; set; } = string.Empty;
+
+    [JsonPropertyName("display_name")]
+    public string DisplayName { get; set; } = string.Empty;
+}
+
+public sealed class PlayerSummary
+{
+    public long Id { get; set; }
+    public string Username { get; set; } = string.Empty;
+    public string DisplayName { get; set; } = string.Empty;
+    public string? Email { get; set; }
+    public bool IsAdmin { get; set; }
+    public bool IsDeveloper { get; set; }
+    public bool IsVerified { get; set; }
+    public bool IsJunior { get; set; }
+    public bool Online { get; set; }
+    public int Level { get; set; }
+    public int XP { get; set; }
+    public DateTime? LastSeenAt { get; set; }
+    public DateTime? BannedUntil { get; set; }
+}
+
+public sealed class RoomSummary
+{
+    public long Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public long CreatorPlayerId { get; set; }
+    public int BlobCount { get; set; }
+    public bool IsAGRoom { get; set; }
+    public bool IsDormRoom { get; set; }
+}
+
+public sealed class InstanceSummary
+{
+    public long RoomInstanceId { get; set; }
+    public long RoomId { get; set; }
+    public string RoomName { get; set; } = string.Empty;
+    public string PhotonRoomId { get; set; } = string.Empty;
+    public string PhotonRegionId { get; set; } = string.Empty;
+    public int MaxCapacity { get; set; }
+    public bool IsPrivate { get; set; }
+    public List<InstanceParticipant> Participants { get; set; } = [];
+}
+
+public sealed class InstanceParticipant
+{
+    public long Id { get; set; }
+    public string Username { get; set; } = string.Empty;
+    public string DisplayName { get; set; } = string.Empty;
+    public bool IsMaster { get; set; }
+}
+
+public sealed class ServerSettingsDto
+{
+    public bool SignupsDisabled { get; set; }
+    public bool GlobalFriendsEnabled { get; set; }
+    public bool WeeklyChallengesCompletedRequired { get; set; }
+    public DateTime UpdatedAt { get; set; }
+}
+
+public sealed class AdminStats
+{
+    public PlayerStats Players { get; set; } = new();
+    public RoomStats Rooms { get; set; } = new();
+    public int Inventions { get; set; }
+    public PhotoStats Photos { get; set; } = new();
+    public ModerationStats Moderation { get; set; } = new();
+    public DateTime ServerTime { get; set; }
+}
+
+public sealed class PlayerStats
+{
+    public int Total { get; set; }
+    public int OnlineNow { get; set; }
+    public int BannedNow { get; set; }
+    public int NewToday { get; set; }
+}
+
+public sealed class RoomStats
+{
+    public int Total { get; set; }
+    public long TotalVisits { get; set; }
+    public long TotalCheers { get; set; }
+    public int ActiveSessionCount { get; set; }
+    public int InGamePlayerCount { get; set; }
+}
+
+public sealed class PhotoStats
+{
+    public int Today { get; set; }
+}
+
+public sealed class ModerationStats
+{
+    public int OpenReports { get; set; }
+    public int ActiveIpBans { get; set; }
+}