Fix Space 404 by packaging and serving frontend dist

Dockerfile

@@ -17,5 +17,6 @@ FROM alpine:3.22
 WORKDIR /app
 ENV PORT=7860
 COPY --from=backend-builder /out/fastfileviewer /app/fastfileviewer
+COPY --from=backend-builder /app/backend/web/dist /app/web/dist
 EXPOSE 7860
 CMD ["/app/fastfileviewer"]

backend/cmd/server/main.go

@@ -61,12 +61,17 @@ func main() {
 		api.GET("/tasks/:id/stream", taskHandler.Stream)
 	}
 
-	frontendDist := filepath.Join("web", "dist")
+	frontendDist := filepath.Join("/app", "web", "dist")
+	if _, err := os.Stat(frontendDist); err != nil {
+		frontendDist = filepath.Join("web", "dist")
+	}
 	if _, err := os.Stat(frontendDist); err == nil {
 		router.Static("/assets", filepath.Join(frontendDist, "assets"))
 		router.NoRoute(func(ctx *gin.Context) {
 			ctx.File(filepath.Join(frontendDist, "index.html"))
 		})
+	} else {
+		log.Printf("frontend dist not found, only API routes are available")
 	}
 
 	log.Printf("server listening on :%s", cfg.Port)