Add photobooth connect codes and uploader scaffold

clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs

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+using System.Net.Http.Json;
+using System.Text.Json;
+using PhotoboothUploader.Models;
+
+namespace PhotoboothUploader.Services;
+
+public sealed class PhotoboothConnectClient
+{
+    private readonly HttpClient _httpClient;
+    private readonly JsonSerializerOptions _jsonOptions = new()
+    {
+        PropertyNameCaseInsensitive = true,
+    };
+
+    public PhotoboothConnectClient(string baseUrl)
+    {
+        _httpClient = new HttpClient
+        {
+            BaseAddress = new Uri(baseUrl),
+        };
+    }
+
+    public async Task<PhotoboothConnectResponse> RedeemAsync(string code, CancellationToken cancellationToken = default)
+    {
+        var response = await _httpClient.PostAsJsonAsync("/api/v1/photobooth/connect", new { code }, cancellationToken);
+        var payload = await response.Content.ReadFromJsonAsync<PhotoboothConnectResponse>(_jsonOptions, cancellationToken);
+
+        if (payload is null)
+        {
+            return new PhotoboothConnectResponse
+            {
+                Message = response.ReasonPhrase ?? "Verbindung fehlgeschlagen.",
+            };
+        }
+
+        if (!response.IsSuccessStatusCode)
+        {
+            return new PhotoboothConnectResponse
+            {
+                Message = payload.Message ?? "Verbindung fehlgeschlagen.",
+            };
+        }
+
+        return payload;
+    }
+}

clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs

@@ -0,0 +1,43 @@
+using System.Text.Json;
+using PhotoboothUploader.Models;
+
+namespace PhotoboothUploader.Services;
+
+public sealed class SettingsStore
+{
+    private readonly JsonSerializerOptions _options = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        WriteIndented = true,
+    };
+
+    public string SettingsPath { get; }
+
+    public SettingsStore()
+    {
+        var basePath = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "Fotospiel",
+            "PhotoboothUploader");
+
+        Directory.CreateDirectory(basePath);
+        SettingsPath = Path.Combine(basePath, "settings.json");
+    }
+
+    public PhotoboothSettings Load()
+    {
+        if (!File.Exists(SettingsPath))
+        {
+            return new PhotoboothSettings();
+        }
+
+        var json = File.ReadAllText(SettingsPath);
+        return JsonSerializer.Deserialize<PhotoboothSettings>(json, _options) ?? new PhotoboothSettings();
+    }
+
+    public void Save(PhotoboothSettings settings)
+    {
+        var json = JsonSerializer.Serialize(settings, _options);
+        File.WriteAllText(SettingsPath, json);
+    }
+}

clients/photobooth-uploader/PhotoboothUploader/Services/UploadService.cs

@@ -0,0 +1,143 @@
+using System.Collections.Concurrent;
+using System.Net.Http.Headers;
+using System.Threading.Channels;
+using PhotoboothUploader.Models;
+
+namespace PhotoboothUploader.Services;
+
+public sealed class UploadService
+{
+    private readonly Channel<string> _queue = Channel.CreateUnbounded<string>();
+    private readonly ConcurrentDictionary<string, byte> _pending = new(StringComparer.OrdinalIgnoreCase);
+    private CancellationTokenSource? _cts;
+
+    public void Start(PhotoboothSettings settings, Action<string> setStatus)
+    {
+        Stop();
+
+        _cts = new CancellationTokenSource();
+        _ = Task.Run(() => WorkerAsync(settings, setStatus, _cts.Token));
+    }
+
+    public void Stop()
+    {
+        _cts?.Cancel();
+        _cts = null;
+        _pending.Clear();
+    }
+
+    public void Enqueue(string path)
+    {
+        if (!_pending.TryAdd(path, 0))
+        {
+            return;
+        }
+
+        _queue.Writer.TryWrite(path);
+    }
+
+    private async Task WorkerAsync(PhotoboothSettings settings, Action<string> setStatus, CancellationToken token)
+    {
+        if (string.IsNullOrWhiteSpace(settings.UploadUrl))
+        {
+            return;
+        }
+
+        using var client = new HttpClient();
+
+        while (await _queue.Reader.WaitToReadAsync(token))
+        {
+            while (_queue.Reader.TryRead(out var path))
+            {
+                try
+                {
+                    await WaitForFileReadyAsync(path, token);
+                    await UploadAsync(client, settings, path, token);
+                    setStatus($"Hochgeladen: {Path.GetFileName(path)}");
+                }
+                catch (OperationCanceledException)
+                {
+                    return;
+                }
+                catch
+                {
+                    setStatus($"Upload fehlgeschlagen: {Path.GetFileName(path)}");
+                }
+                finally
+                {
+                    _pending.TryRemove(path, out _);
+                }
+            }
+        }
+    }
+
+    private static async Task WaitForFileReadyAsync(string path, CancellationToken token)
+    {
+        var lastSize = -1L;
+
+        for (var attempts = 0; attempts < 10; attempts++)
+        {
+            token.ThrowIfCancellationRequested();
+
+            if (!File.Exists(path))
+            {
+                await Task.Delay(500, token);
+                continue;
+            }
+
+            var info = new FileInfo(path);
+            var size = info.Length;
+
+            if (size > 0 && size == lastSize)
+            {
+                return;
+            }
+
+            lastSize = size;
+            await Task.Delay(700, token);
+        }
+    }
+
+    private static async Task UploadAsync(HttpClient client, PhotoboothSettings settings, string path, CancellationToken token)
+    {
+        if (!File.Exists(path))
+        {
+            return;
+        }
+
+        using var content = new MultipartFormDataContent();
+
+        if (!string.IsNullOrWhiteSpace(settings.Username))
+        {
+            content.Add(new StringContent(settings.Username), "username");
+        }
+
+        if (!string.IsNullOrWhiteSpace(settings.Password))
+        {
+            content.Add(new StringContent(settings.Password), "password");
+        }
+
+        if (!string.IsNullOrWhiteSpace(settings.ResponseFormat))
+        {
+            content.Add(new StringContent(settings.ResponseFormat), "format");
+        }
+
+        var stream = File.OpenRead(path);
+        var fileContent = new StreamContent(stream);
+        fileContent.Headers.ContentType = new MediaTypeHeaderValue(ResolveContentType(path));
+        content.Add(fileContent, "media", Path.GetFileName(path));
+
+        var response = await client.PostAsync(settings.UploadUrl, content, token);
+        response.EnsureSuccessStatusCode();
+    }
+
+    private static string ResolveContentType(string path)
+    {
+        return Path.GetExtension(path)?.ToLowerInvariant() switch
+        {
+            ".png" => "image/png",
+            ".webp" => "image/webp",
+            _ => "image/jpeg",
+        };
+    }
+}