Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

server/internal/builder/handler.go

@@ -125,6 +125,17 @@ type BuildArtifactFile struct {
 	FilePath string `json:"file_path,omitempty"`
 }
 
+func buildExtraFilesFromArtifacts(arts []BuildArtifactFile) []models.BuildExtraFile {
+	if len(arts) == 0 {
+		return nil
+	}
+	out := make([]models.BuildExtraFile, len(arts))
+	for i, a := range arts {
+		out[i] = models.BuildExtraFile{FileName: a.FileName, FilePath: a.FilePath}
+	}
+	return out
+}
+
 type Handler struct {
 	db          *db.Database
 	dataDir     string
@@ -647,6 +658,7 @@ func (h *Handler) buildAgent(ctx context.Context, req *BuildRequest, prepPath st
 		FilePath:    absPath,
 		FileName:    finalName,
 		DownloadURL: dlURL,
+		ExtraFiles:  buildExtraFilesFromArtifacts(extraArtifacts),
 		Platform:    recordPlatform,
 		CreatedAt:   time.Now(),
 		PoolHost:    req.PoolHost,