fix: build

Dockerfile

@@ -14,7 +14,7 @@ COPY backend/go.mod backend/go.sum ./
 RUN go mod download
 COPY backend/ ./
 COPY --from=frontend-builder /app/frontend/public/ ./web/static/
-RUN go build -ldflags="-w -s" -o aethera ./cmd
+RUN find ./web/static -type d -empty -delete && go build -ldflags="-w -s" -o aethera ./cmd
 
 # Stage 3: Minimal Runtime
 FROM alpine:3.21