feat: onboarding 2-keys + Windows install w/o admin (v0.7.3)

Two user-reported pain points:

1. First-run setup proposed only MiniMax (no MiMo step). Onboarding
   now offers both keys side-by-side under a single "apikey" step,
   with per-key Validate buttons. At least one must be valid to
   proceed; the rest of the providers (OpenAI/Anthropic/Z.AI/Ollama)
   are not shown in the wizard — they're configured later via the
   Config tab. Active provider = MiniMax if valid, else MiMo.

2. Windows install instructions failed: Move-Item to C:\Windows
   requires admin. Replaced with a no-admin 4-line snippet that
   installs to %LOCALAPPDATA%\Muyue and calls a new subcommand
   `muyue install-shortcuts` to create Desktop + Start Menu .lnk
   files and add the install dir to the user PATH. Shortcut creation
   uses WScript.Shell COM via PowerShell — keeps Go binary
   dependency-free. Folder paths resolved through
   [Environment]::GetFolderPath so OneDrive/redirected profiles
   work too.

- cmd/muyue/commands/install_shortcuts.go: new file
- web/src/components/OnboardingWizard.jsx: 2-key apikey step
- .gitea/workflows/ci-main.yml: updated install snippet
- internal/version/version.go: 0.7.2 → 0.7.3
- CHANGELOG.md: v0.7.3 entry

cmd/muyue/commands/install_shortcuts.go

@@ -0,0 +1,151 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"github.com/spf13/cobra"
+)
+
+// installShortcutsCmd creates desktop + Start Menu shortcuts on Windows so
+// non-technical users can launch Muyue without opening a terminal. It also
+// adds the install directory to the user's PATH (per-user, no admin).
+//
+// Implementation note: shortcut (.lnk) creation on Windows is most reliable
+// via WScript.Shell COM. We invoke it via PowerShell — keeps the Go binary
+// dependency-free and works on any Windows 10+ host.
+var installShortcutsCmd = &cobra.Command{
+	Use:   "install-shortcuts",
+	Short: "Create Desktop + Start Menu shortcuts (Windows only) and add Muyue to PATH",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if runtime.GOOS != "windows" {
+			fmt.Println("install-shortcuts is a Windows-only command (no-op on this platform)")
+			return nil
+		}
+
+		exe, err := os.Executable()
+		if err != nil {
+			return fmt.Errorf("locate executable: %w", err)
+		}
+		exe, _ = filepath.Abs(exe)
+		installDir := filepath.Dir(exe)
+
+		fmt.Println("Installing Muyue shortcuts...")
+		fmt.Printf("  Executable : %s\n", exe)
+
+		desktop, err := userShellFolder("Desktop")
+		if err != nil {
+			return fmt.Errorf("locate Desktop folder: %w", err)
+		}
+		startMenu, err := userShellFolder("Programs")
+		if err != nil {
+			return fmt.Errorf("locate Start Menu Programs folder: %w", err)
+		}
+
+		desktopLnk := filepath.Join(desktop, "Muyue.lnk")
+		startLnk := filepath.Join(startMenu, "Muyue.lnk")
+
+		if err := createWindowsShortcut(desktopLnk, exe, installDir, "Muyue — AI-powered dev environment"); err != nil {
+			return fmt.Errorf("create desktop shortcut: %w", err)
+		}
+		fmt.Printf("  Desktop    : %s\n", desktopLnk)
+
+		if err := createWindowsShortcut(startLnk, exe, installDir, "Muyue — AI-powered dev environment"); err != nil {
+			return fmt.Errorf("create Start Menu shortcut: %w", err)
+		}
+		fmt.Printf("  Start Menu : %s\n", startLnk)
+
+		if err := addUserPATH(installDir); err != nil {
+			fmt.Fprintf(os.Stderr, "  PATH       : warning — could not add %s to user PATH: %v\n", installDir, err)
+		} else {
+			fmt.Printf("  PATH       : added %s (open a new terminal to pick it up)\n", installDir)
+		}
+
+		fmt.Println("\nDone — double-click the Muyue icon on your Desktop to launch.")
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(installShortcutsCmd)
+}
+
+// userShellFolder asks Windows for a user shell folder via PowerShell —
+// resilient to OneDrive redirection and non-default profile locations.
+// `which` is one of: Desktop, Programs (Start Menu Programs), StartMenu.
+func userShellFolder(which string) (string, error) {
+	ps := fmt.Sprintf(`[Environment]::GetFolderPath('%s')`, which)
+	out, err := exec.Command("powershell", "-NoLogo", "-NoProfile", "-Command", ps).Output()
+	if err != nil {
+		return "", err
+	}
+	path := stripTrailingWhitespace(string(out))
+	if path == "" {
+		return "", fmt.Errorf("empty path for %s", which)
+	}
+	return path, nil
+}
+
+func stripTrailingWhitespace(s string) string {
+	for len(s) > 0 && (s[len(s)-1] == '\n' || s[len(s)-1] == '\r' || s[len(s)-1] == ' ' || s[len(s)-1] == '\t') {
+		s = s[:len(s)-1]
+	}
+	return s
+}
+
+// createWindowsShortcut generates a .lnk via WScript.Shell COM. The arguments
+// are passed through PowerShell variables (not interpolated into the script
+// body) to avoid quoting issues with paths containing spaces or special chars.
+func createWindowsShortcut(lnkPath, target, workingDir, description string) error {
+	script := `
+$lnk = $env:MUYUE_LNK
+$target = $env:MUYUE_TARGET
+$workdir = $env:MUYUE_WORKDIR
+$desc = $env:MUYUE_DESC
+$wsh = New-Object -ComObject WScript.Shell
+$sc = $wsh.CreateShortcut($lnk)
+$sc.TargetPath = $target
+$sc.WorkingDirectory = $workdir
+$sc.Description = $desc
+$sc.IconLocation = "$target,0"
+$sc.Save()
+`
+	cmd := exec.Command("powershell", "-NoLogo", "-NoProfile", "-Command", script)
+	cmd.Env = append(os.Environ(),
+		"MUYUE_LNK="+lnkPath,
+		"MUYUE_TARGET="+target,
+		"MUYUE_WORKDIR="+workingDir,
+		"MUYUE_DESC="+description,
+	)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("powershell: %v: %s", err, string(out))
+	}
+	return nil
+}
+
+// addUserPATH appends installDir to the user's PATH if not already present.
+// Uses PowerShell to read/write the User-scope environment via .NET API,
+// which broadcasts WM_SETTINGCHANGE so new processes pick it up.
+func addUserPATH(installDir string) error {
+	script := `
+$dir = $env:MUYUE_INSTALL_DIR
+$current = [Environment]::GetEnvironmentVariable('Path', 'User')
+if ($current -eq $null) { $current = '' }
+$parts = $current -split ';' | Where-Object { $_ -ne '' }
+if ($parts -notcontains $dir) {
+    $new = if ($current -eq '') { $dir } else { "$current;$dir" }
+    [Environment]::SetEnvironmentVariable('Path', $new, 'User')
+}
+`
+	cmd := exec.Command("powershell", "-NoLogo", "-NoProfile", "-Command", script)
+	cmd.Env = append(os.Environ(), "MUYUE_INSTALL_DIR="+installDir)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("powershell: %v: %s", err, string(out))
+	}
+	return nil
+}