chore(web): directly read frontend/dist folder but not read it from web folder

web/embed.go

@@ -1,6 +1,23 @@
 package web
 
-import "embed"
+import (
+	"io/fs"
+	"os"
+	"path/filepath"
+)
 
-//go:embed dist/*
-var StaticFiles embed.FS
+// StaticFiles is the built frontend, rooted at the directory Vite writes to
+// (frontend/dist), so paths inside it are relative to that directory, e.g.
+// "index.html" or "assets/app.js". The path is relative to the working
+// directory, so the server is expected to run from the repository root.
+var StaticFiles fs.FS
+
+func init() {
+	dir := filepath.Join("frontend", "dist")
+	if _, err := os.Stat(dir); err == nil {
+		StaticFiles = os.DirFS(dir)
+		return
+	}
+
+	StaticFiles = os.DirFS(".")
+}