Fix CI: Add build tags to exclude dapp-fm packages from standard builds

Co-authored-by: Snider <631881+Snider@users.noreply.github.com>

cmd/dapp-fm-app/main.go

@@ -1,3 +1,5 @@
+// +build dappfm
+
 // dapp-fm-app is a native desktop media player for dapp.fm
 // Decryption in Go, media served via Wails asset handler (same origin, no CORS)
 package main

cmd/dapp-fm/main.go

@@ -1,3 +1,5 @@
+// +build dappfm
+
 // dapp-fm CLI provides headless media player functionality
 // For native desktop app with WebView, use dapp-fm-app instead
 package main

pkg/player/assets.go

@@ -1,3 +1,5 @@
+// +build dappfm
+
 package player
 
 import (

pkg/player/assets_stub.go

@@ -0,0 +1,37 @@
+// +build !dappfm
+
+package player
+
+import (
+	"embed"
+	"io/fs"
+)
+
+// Assets embeds all frontend files for the media player (except demo track)
+// To build with full assets including demo track, use: go build -tags dappfm
+//
+//go:embed frontend/index.html
+//go:embed frontend/wasm_exec.js
+//go:embed frontend/stmf.wasm
+var assets embed.FS
+
+// Assets returns the embedded filesystem with frontend/ prefix stripped
+var Assets fs.FS
+
+func init() {
+	var err error
+	Assets, err = fs.Sub(assets, "frontend")
+	if err != nil {
+		panic("failed to create sub filesystem: " + err.Error())
+	}
+}
+
+// GetDemoTrack returns an error since demo track is not available in stub build
+func GetDemoTrack() ([]byte, error) {
+	return nil, fs.ErrNotExist
+}
+
+// GetIndex returns the main HTML page
+func GetIndex() ([]byte, error) {
+	return fs.ReadFile(Assets, "index.html")
+}