Add api

.gitignore

@@ -155,4 +155,8 @@ $RECYCLE.BIN/
 .DS_Store
 /packages
 
-TODO.txt
+TODO.txt
+
+# Front-react build output in wwwroot
+SDMeta.Api/wwwroot/*
+!SDMeta.Api/wwwroot/.gitkeep

SDMeta.Api/Contracts/ApiContracts.cs

@@ -0,0 +1,84 @@
+using SDMeta.Cache;
+
+namespace SDMeta.Api.Contracts;
+
+public sealed record ApiError(string Code, string Message, object? Details = null);
+
+public sealed record ImageListItem(
+    string ImageId,
+    string FileName,
+    string? FullPromptHash,
+    string ThumbnailUrl,
+    string ContentUrl);
+
+public sealed record PromptGroup(
+    string FullPromptHash,
+    int Count,
+    IReadOnlyList<ImageListItem> Items);
+
+public sealed record ImageListResponse(
+    IReadOnlyList<ImageListItem>? Items,
+    IReadOnlyList<PromptGroup>? Groups,
+    string? NextCursor,
+    int TotalApprox);
+
+public sealed record ParsedPrompt(
+    string? Positive,
+    string? Negative,
+    string? Parameters,
+    string? Warnings);
+
+public sealed record ImageDetailResponse(
+    string ImageId,
+    string FileName,
+    DateTime LastUpdatedUtc,
+    long LengthBytes,
+    PromptFormat PromptFormat,
+    string? PromptRaw,
+    ParsedPrompt? PromptParsed,
+    string? Model,
+    string? ModelHash,
+    string? PromptHash,
+    string? NegativePromptHash,
+    bool Exists);
+
+public sealed record ModelResponseItem(
+    string? Model,
+    string? ModelHash,
+    int Count,
+    string Label);
+
+public sealed record StartScanResponse(Guid ScanId);
+
+public sealed record PartialScanRequest(
+    IReadOnlyList<string>? Added,
+    IReadOnlyList<string>? Removed,
+    bool UsePendingWatcherQueue = false);
+
+public enum ScanStatus
+{
+    Queued,
+    Running,
+    Completed,
+    Failed,
+}
+
+public sealed record ScanStateResponse(
+    Guid ScanId,
+    string Type,
+    ScanStatus Status,
+    float Progress,
+    int AddedCount,
+    int RemovedCount,
+    DateTime StartedUtc,
+    DateTime? CompletedUtc,
+    string? Error,
+    long Revision);
+
+public sealed record PendingChangesResponse(int AddedCount, int RemovedCount);
+
+public sealed record StorageSettingsResponse(
+    IReadOnlyList<string> ImageDirs,
+    string ThumbnailDir,
+    string DbPath,
+    long? DbSizeBytes);