studio: Polish Windows installer/setup logs (#4736)

* style(windows): clean installer/setup log output and remove seeded credential banner

* Keep startup credential hint without exposing plaintext password

Print the username and .bootstrap_password file path on first-run
admin creation instead of the raw password. Headless / Docker / SSH
operators still get a startup-time hint for initial sign-in, and the
plaintext credential no longer appears in terminal output or logs.

---------

Co-authored-by: Daniel Han <danielhanchen@users.noreply.github.com>

install.ps1

@@ -749,7 +749,6 @@ shell.Run cmd, 0, False
     } else {
         step "gpu" "none (chat-only / GGUF)" "Yellow"
         substep "Training and GPU inference require an NVIDIA GPU with drivers installed." "Yellow"
-        substep "https://www.nvidia.com/Download/index.aspx" "Yellow"
     }
 
     # ── Choose the correct PyTorch index URL based on driver CUDA version ──
@@ -777,10 +776,10 @@ shell.Run cmd, 0, False
     # ── Print CPU-only hint when no GPU detected ──
     if (-not $SkipTorch -and $TorchIndexUrl -like "*/cpu") {
         Write-Host ""
-        Write-Host "  NOTE: No NVIDIA GPU detected." -ForegroundColor Yellow
-        Write-Host "  Installing CPU-only PyTorch. If you only need GGUF chat/inference,"
-        Write-Host "  re-run with --no-torch for a faster, lighter install:"
-        Write-Host "    .\install.ps1 --no-torch"
+        substep "No NVIDIA GPU detected." "Yellow"
+        substep "Installing CPU-only PyTorch. If you only need GGUF chat/inference," "Yellow"
+        substep "re-run with --no-torch for a faster, lighter install:" "Yellow"
+        substep ".\install.ps1 --no-torch" "Yellow"
         Write-Host ""
     }
 

studio/backend/main.py

@@ -121,13 +121,13 @@ async def lifespan(app: FastAPI):
     if storage.ensure_default_admin():
         bootstrap_pw = storage.get_bootstrap_password()
         app.state.bootstrap_password = bootstrap_pw
+
+        bootstrap_path = storage.DB_PATH.parent / ".bootstrap_password"
         print("\n" + "=" * 60)
         print("DEFAULT ADMIN ACCOUNT CREATED")
-        print(
-            "Sign in with the seeded credentials and change the password immediately:\n"
-        )
         print(f"    username: {storage.DEFAULT_ADMIN_USERNAME}")
-        print(f"    password: {bootstrap_pw}\n")
+        print(f"    password saved to: {bootstrap_path}")
+        print("    Open the Studio UI to sign in and change it.")
         print("=" * 60 + "\n")
     else:
         app.state.bootstrap_password = storage.get_bootstrap_password()

studio/setup.ps1

@@ -490,8 +490,7 @@ if (-not $HasNvidiaSmi) {
 if (-not $HasNvidiaSmi) {
     Write-Host ""
     step "gpu" "none (chat-only / GGUF)" "Yellow"
-    Write-Host "       Training and GPU inference require an NVIDIA GPU with drivers installed." -ForegroundColor Yellow
-    Write-Host "       https://www.nvidia.com/Download/index.aspx" -ForegroundColor Yellow
+    substep "Training and GPU inference require an NVIDIA GPU with drivers installed." "Yellow"
     Write-Host ""
 } else {
     step "gpu" "NVIDIA GPU detected"