chore: initial project import

backend/src/Monitor.Backend.Gateway/RawChunkInbox.cs

@@ -0,0 +1,28 @@
+using Fleet.Server;
+using Monitor.Backend.Application;
+using Monitor.Protocol;
+
+namespace Monitor.Backend.Gateway;
+
+/// <summary>
+/// RawChunk 收件箱（二进制通道 16）：持久化之后才返回，Fleet 随后才回复 ACK，按 chunk_id 去重。
+/// 永远不可能被接受的块（损坏、冒名、未知 Kind）也确认掉并记录原因，否则节点会无限重发。
+/// </summary>
+public sealed class RawChunkInbox : IInbox
+{
+    private readonly IngestService _ingest;
+
+    public RawChunkInbox(IngestService ingest)
+    {
+        _ingest = ingest;
+    }
+
+    public byte Channel => MonitorChannels.RawChunk;
+
+    public async ValueTask<InboxOutcome> HandleAsync(NodeRecord node, Guid msgId, ReadOnlyMemory<byte> payload, CancellationToken ct) =>
+        await _ingest.IngestAsync(node.Id, msgId, payload, ct) switch
+        {
+            IngestOutcome.Stored => InboxOutcome.Stored,
+            _ => InboxOutcome.Duplicate,
+        };
+}