build script + winamp_path optional

- Add build.ps1: one-shot PowerShell build with version from git tag
- winamp_path config is now optional; roadamp works with any running
  Winamp instance regardless of install location (FindWindow does the
  discovery). Path is only needed if roadamp should launch Winamp itself.
- Remove hardcoded C:\Program Files\Winamp default

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

build.ps1

@@ -0,0 +1,51 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+    Build roadamp.exe
+
+.PARAMETER OutDir
+    Output directory. Defaults to the project root (where this script lives).
+
+.PARAMETER Version
+    Version string embedded via -ldflags. Defaults to the current git tag/commit.
+
+.EXAMPLE
+    .\build.ps1
+    .\build.ps1 -OutDir C:\Deploy\roadamp
+#>
+param(
+    [string]$OutDir  = $PSScriptRoot,
+    [string]$Version = ""
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+Push-Location $PSScriptRoot
+try {
+    # Resolve version from git if not supplied
+    if (-not $Version) {
+        $tag    = git describe --tags --always --dirty 2>$null
+        $Version = if ($tag) { $tag } else { "dev" }
+    }
+
+    $out = Join-Path $OutDir "roadamp.exe"
+
+    Write-Host "Building roadamp $Version → $out" -ForegroundColor Cyan
+
+    $env:GOOS   = "windows"
+    $env:GOARCH = "amd64"
+    $env:CGO_ENABLED = "0"
+
+    go build `
+        -trimpath `
+        -ldflags "-s -w -X main.Version=$Version" `
+        -o $out `
+        ./cmd/roadamp
+
+    $size = [math]::Round((Get-Item $out).Length / 1MB, 2)
+    Write-Host "Done  $out  (${size} MB)" -ForegroundColor Green
+}
+finally {
+    Pop-Location
+}

config.yaml.example

@@ -1,4 +1,8 @@
 port: 8080
-winamp_path: "C:\\Program Files\\Winamp\\Winamp.exe"
+
+# Optional: full path to winamp.exe — only needed if you want roadamp to
+# launch Winamp for you. Leave empty (or omit) if you start Winamp yourself.
+# winamp_path: "C:\\Program Files\\Winamp\\Winamp.exe"
+
 killist_file: "killist.dat"
-resume_file: "resume.dat"
+resume_file:  "resume.dat"

internal/server/server.go

@@ -37,7 +37,6 @@ type Config struct {
 func loadConfig(path string) (Config, error) {
 	cfg := Config{
 		Port:         8080,
-		WinampPath:   `C:\Program Files\Winamp\Winamp.exe`,
 		KillListFile: "killist.dat",
 		ResumeFile:   "resume.dat",
 	}
@@ -228,7 +227,9 @@ func (s *Server) handleCommand(raw []byte) {
 		_ = s.kl.Remove(cmd.Title)
 	case "winamp_start":
 		if !s.wa.IsRunning() {
-			_ = exec.Command(s.cfg.WinampPath).Start()
+			if s.cfg.WinampPath != "" {
+				_ = exec.Command(s.cfg.WinampPath).Start()
+			}
 		}
 	}
 	// Push a fresh status after any command.
@@ -417,6 +418,10 @@ func (s *Server) handleWinampStart(w http.ResponseWriter, r *http.Request) {
 		jsonOK(w, map[string]string{"status": "already_running"})
 		return
 	}
+	if s.cfg.WinampPath == "" {
+		http.Error(w, "winamp_path not configured", http.StatusServiceUnavailable)
+		return
+	}
 	if err := exec.Command(s.cfg.WinampPath).Start(); err != nil {
 		http.Error(w, err.Error(), 500)
 		return