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/db/builds_test.go

@@ -61,6 +61,27 @@ func TestBuildCRUDAndList(t *testing.T) {
 	}
 }
 
+func TestBuildExtraFilesRoundTrip(t *testing.T) {
+	d := openTestDB(t)
+	build := &models.BuildRecord{
+		ID: "build-extra", WorkerName: "w", ServerURL: "u", Wallet: "w", CreatedAt: time.Now(),
+		DownloadURL: "/api/v1/builds/build-extra/download",
+		ExtraFiles: []models.BuildExtraFile{
+			{FileName: "payload.enc", FilePath: "/data/payload.enc"},
+			{FileName: "README.txt"},
+		},
+	}
+	insertBuild(t, d, build)
+
+	got, err := d.GetBuild("build-extra")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(got.ExtraFiles) != 2 || got.ExtraFiles[0].FileName != "payload.enc" {
+		t.Fatalf("extra_files mismatch: %+v", got.ExtraFiles)
+	}
+}
+
 func TestGetBuildNotFound(t *testing.T) {
 	d := openTestDB(t)
 	_, err := d.GetBuild("missing")