feat(ingestion): implement hybrid metadata verification form in ingestion modal #34

src/NexusReader.Application/Commands/Library/IngestEbookCommand.cs

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+using NexusReader.Application.Abstractions.Messaging;
+
+namespace NexusReader.Application.Commands.Library;
+
+public record IngestEbookCommand(
+    string Title,
+    string AuthorName,
+    byte[]? CoverImage,
+    byte[] EpubData,
+    string UserId,
+    string TenantId = "global"
+) : ICommand<Guid>;

src/NexusReader.Application/Commands/Library/IngestEbookCommandHandler.cs

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+using FluentResults;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using NexusReader.Application.Abstractions.Messaging;
+using NexusReader.Application.Abstractions.Services;
+using NexusReader.Data.Persistence;
+using NexusReader.Domain.Entities;
+
+namespace NexusReader.Application.Commands.Library;
+
+public class IngestEbookCommandHandler : IRequestHandler<IngestEbookCommand, Result<Guid>>
+{
+    private readonly IDbContextFactory<AppDbContext> _dbContextFactory;
+    private readonly IBookStorageService _storageService;
+
+    public IngestEbookCommandHandler(
+        IDbContextFactory<AppDbContext> dbContextFactory,
+        IBookStorageService storageService)
+    {
+        _dbContextFactory = dbContextFactory;
+        _storageService = storageService;
+    }
+
+    public async Task<Result<Guid>> Handle(IngestEbookCommand request, CancellationToken cancellationToken)
+    {
+        try
+        {
+            using var context = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+
+            // 1. Save Files
+            var epubPath = await _storageService.SaveEbookAsync(request.EpubData, $"{request.Title}.epub");
+            var coverUrl = request.CoverImage != null && request.CoverImage.Length > 0
+                ? await _storageService.SaveCoverAsync(request.CoverImage, $"{request.Title}_cover.jpg")
+                : null;
+
+            // 2. Resolve Author
+            var authorName = string.IsNullOrWhiteSpace(request.AuthorName) ? "Unknown Author" : request.AuthorName.Trim();
+            var author = await context.Authors
+                .FirstOrDefaultAsync(a => a.Name.ToLower() == authorName.ToLower(), cancellationToken);
+
+            if (author == null)
+            {
+                author = new Author { Name = authorName };
+                context.Authors.Add(author);
+                // We need to save to get the Author ID if we want to use it, 
+                // but EF will handle it if we assign the object.
+            }
+
+            // 3. Create Ebook
+            var ebook = new Ebook
+            {
+                Title = request.Title,
+                Author = author,
+                FilePath = epubPath,
+                CoverUrl = coverUrl,
+                UserId = request.UserId,
+                TenantId = request.TenantId,
+                AddedDate = DateTime.UtcNow
+            };
+
+            context.Ebooks.Add(ebook);
+            await context.SaveChangesAsync(cancellationToken);
+
+            return Result.Ok(ebook.Id);
+        }
+        catch (Exception ex)
+        {
+            return Result.Fail(new Error("Failed to ingest ebook").CausedBy(ex));
+        }
+    }
+}

src/NexusReader.Application/Commands/Library/IngestEbookRequest.cs

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+namespace NexusReader.Application.Commands.Library;
+
+public record IngestEbookRequest(
+    string Title,
+    string AuthorName,
+    string? CoverImageBase64,
+    string EpubDataBase64
+);