Add image management functionality: introduce Image entity and related API endpoints, update database schema to support image storage, and enhance UI with a new gallery feature for image selection and upload. Update translations for gallery-related terms.

backend/src/TeleWave.Application/Images/DeleteImage/DeleteImageCommand.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images.DeleteImage;
+
+/// <summary>Удаляет изображение из реестра и его файл. Ссылки на него у потребителей могут повиснуть
+/// (отдача вернёт 404, UI покажет заглушку).</summary>
+public sealed record DeleteImageCommand(Guid Id) : ICommand<Result>;

backend/src/TeleWave.Application/Images/DeleteImage/DeleteImageCommandHandler.cs

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+using LiteCqrs;
+using Microsoft.EntityFrameworkCore;
+using TeleWave.Application.Common.Interfaces;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images.DeleteImage;
+
+public sealed class DeleteImageCommandHandler(IAppDbContext dbContext, IImageStore storage)
+    : ICommandHandler<DeleteImageCommand, Result>
+{
+    public async Task<Result> Handle(DeleteImageCommand command, CancellationToken cancellationToken)
+    {
+        var image = await dbContext.Images.FirstOrDefaultAsync(
+            i => i.Id == command.Id,
+            cancellationToken
+        );
+        if (image is null)
+            return Result.Failure(ImageErrors.NotFound);
+
+        storage.Delete(image.Id, image.FileExtension);
+        dbContext.Images.Remove(image);
+        return Result.Success();
+    }
+}

backend/src/TeleWave.Application/Images/GetImageFile/GetImageFileQuery.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images.GetImageFile;
+
+/// <summary>Абсолютный путь к файлу изображения (для отдачи). Ошибка — если записи/файла нет.</summary>
+public sealed record GetImageFileQuery(Guid Id) : IQuery<Result<string>>;

backend/src/TeleWave.Application/Images/GetImageFile/GetImageFileQueryHandler.cs

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+using LiteCqrs;
+using Microsoft.EntityFrameworkCore;
+using TeleWave.Application.Common.Interfaces;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images.GetImageFile;
+
+public sealed class GetImageFileQueryHandler(IAppDbContext dbContext, IImageStore storage)
+    : IQueryHandler<GetImageFileQuery, Result<string>>
+{
+    public async Task<Result<string>> Handle(
+        GetImageFileQuery query,
+        CancellationToken cancellationToken
+    )
+    {
+        var image = await dbContext.Images.AsNoTracking()
+            .FirstOrDefaultAsync(i => i.Id == query.Id, cancellationToken);
+        if (image is null)
+            return Result.Failure<string>(ImageErrors.NotFound);
+
+        var path = storage.ResolvePath(image.Id, image.FileExtension);
+        return path is null ? Result.Failure<string>(ImageErrors.NotFound) : Result.Success(path);
+    }
+}

backend/src/TeleWave.Application/Images/ImageDtos.cs

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+using TeleWave.Domain.Images;
+
+namespace TeleWave.Application.Images;
+
+/// <summary>Запись галереи для показа. Файл отдаётся по /api/images/{Id} (URL строит фронт).</summary>
+public sealed record ImageDto(
+    Guid Id,
+    ImageCategory Category,
+    string? OriginalFileName,
+    DateTimeOffset CreatedAt
+);

backend/src/TeleWave.Application/Images/ImageErrors.cs

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+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images;
+
+public static class ImageErrors
+{
+    public static readonly Error NotFound = Error.NotFound(
+        "Images.NotFound",
+        "Изображение не найдено."
+    );
+
+    public static readonly Error InvalidFile = Error.Validation(
+        "Images.InvalidFile",
+        "Недопустимый файл изображения (формат или размер)."
+    );
+}

backend/src/TeleWave.Application/Images/ListImages/ListImagesQuery.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Models;
+using TeleWave.Domain.Images;
+
+namespace TeleWave.Application.Images.ListImages;
+
+/// <summary>Список изображений одной категории (вкладки), новые сверху.</summary>
+public sealed record ListImagesQuery(ImageCategory Category)
+    : IQuery<Result<IReadOnlyList<ImageDto>>>;

backend/src/TeleWave.Application/Images/ListImages/ListImagesQueryHandler.cs

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+using LiteCqrs;
+using Microsoft.EntityFrameworkCore;
+using TeleWave.Application.Common.Interfaces;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Images.ListImages;
+
+public sealed class ListImagesQueryHandler(IAppDbContext dbContext)
+    : IQueryHandler<ListImagesQuery, Result<IReadOnlyList<ImageDto>>>
+{
+    public async Task<Result<IReadOnlyList<ImageDto>>> Handle(
+        ListImagesQuery query,
+        CancellationToken cancellationToken
+    )
+    {
+        var images = await dbContext.Images.AsNoTracking()
+            .Where(i => i.Category == query.Category)
+            .OrderByDescending(i => i.CreatedAt)
+            .Select(i => new ImageDto(i.Id, i.Category, i.OriginalFileName, i.CreatedAt))
+            .ToListAsync(cancellationToken);
+
+        return Result.Success<IReadOnlyList<ImageDto>>(images);
+    }
+}

backend/src/TeleWave.Application/Images/UploadImage/UploadImageCommand.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Models;
+using TeleWave.Domain.Images;
+
+namespace TeleWave.Application.Images.UploadImage;
+
+/// <summary>Регистрирует запись изображения (файл кладёт вызывающий эндпоинт по возвращённому Id).</summary>
+public sealed record UploadImageCommand(
+    ImageCategory Category,
+    string Extension,
+    string? OriginalFileName
+) : ICommand<Result<Guid>>;

backend/src/TeleWave.Application/Images/UploadImage/UploadImageCommandHandler.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Interfaces;
+using TeleWave.Application.Common.Models;
+using TeleWave.Domain.Images;
+
+namespace TeleWave.Application.Images.UploadImage;
+
+public sealed class UploadImageCommandHandler(IAppDbContext dbContext)
+    : ICommandHandler<UploadImageCommand, Result<Guid>>
+{
+    public Task<Result<Guid>> Handle(UploadImageCommand command, CancellationToken cancellationToken)
+    {
+        var image = Image.Create(command.Category, command.Extension, command.OriginalFileName);
+        dbContext.Images.Add(image);
+        return Task.FromResult(Result.Success(image.Id));
+    }
+}