feat(web): initialize Next.js project with Tailwind CSS and TypeScript setup

Dockerfile

@@ -0,0 +1,24 @@
+# --- web build stage ---
+FROM node:22-alpine AS web
+WORKDIR /app
+COPY web/package.json web/package-lock.json* ./web/
+RUN cd web && (test -f package-lock.json && npm ci --no-fund --no-audit || npm install --no-fund --no-audit)
+COPY web ./web
+RUN cd web && npm run build
+
+# --- go build stage ---
+FROM golang:1.24-alpine AS build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+COPY --from=web /app/web/out ./web/out
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags='-s -w' -o /out/flow ./cmd/flow
+
+# --- runtime stage ---
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates tzdata
+COPY --from=build /out/flow /usr/local/bin/flow
+EXPOSE 8080 9080
+ENTRYPOINT ["/usr/local/bin/flow"]
+CMD ["serve"]