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/main_test.go

@@ -47,13 +47,19 @@ func TestFindProjectRootFromServerDir(t *testing.T) {
 		t.Fatal(err)
 	}
 	root := findProjectRoot()
-	runBat := filepath.Join(root, "run.bat")
-	if _, err := os.Stat(runBat); err != nil {
-		t.Fatalf("findProjectRoot=%q missing run.bat: %v", root, err)
+	found := false
+	for _, name := range []string{"devrun.bat", "LAUNCH.bat", "run.bat"} {
+		if _, err := os.Stat(filepath.Join(root, name)); err == nil {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Fatalf("findProjectRoot=%q missing devrun.bat/LAUNCH.bat/run.bat", root)
 	}
 	// When tests run from server/, root should be parent of cwd or cwd itself.
 	if root != cwd && root != filepath.Dir(cwd) {
-		t.Logf("findProjectRoot=%q cwd=%q (acceptable if run.bat layout differs)", root, cwd)
+		t.Logf("findProjectRoot=%q cwd=%q (acceptable if marker layout differs)", root, cwd)
 	}
 }