feat: commit hash in banner, version command, file upload/download

crates/common/src/protocol.rs

@@ -47,6 +47,19 @@ pub enum ServerMessage {
     FocusWindowRequest { request_id: Uuid, window_id: u64 },
     /// Maximize a window and bring it to the foreground
     MaximizeAndFocusRequest { request_id: Uuid, window_id: u64 },
+    /// Request client version info
+    VersionRequest { request_id: Uuid },
+    /// Upload a file to the client
+    UploadRequest {
+        request_id: Uuid,
+        path: String,
+        content_base64: String,
+    },
+    /// Download a file from the client
+    DownloadRequest {
+        request_id: Uuid,
+        path: String,
+    },
 }
 
 /// Messages sent from the client to the relay server
@@ -81,6 +94,18 @@ pub enum ClientMessage {
         request_id: Uuid,
         windows: Vec<WindowInfo>,
     },
+    /// Response to a version request
+    VersionResponse {
+        request_id: Uuid,
+        version: String,
+        commit: String,
+    },
+    /// Response to a download request
+    DownloadResponse {
+        request_id: Uuid,
+        content_base64: String,
+        size: u64,
+    },
 }
 
 /// Mouse button variants