feat: add integrated web frontend

Dockerfile

@@ -1,9 +1,21 @@
+# ---- Stage 1: build the Vue frontend ----
+FROM node:22-alpine AS web-builder
+
+WORKDIR /web
+RUN corepack enable
+COPY web/package.json web/pnpm-lock.yaml web/pnpm-workspace.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY web/ ./
+RUN pnpm run build
+
+# ---- Stage 2: build the Go backend ----
 FROM golang:1.26 AS builder
 
 WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
+COPY --from=web-builder /web/dist ./web/dist
 RUN CGO_ENABLED=0 GOOS=linux go build -o /out/im_workbench ./cmd/workbench
 
 FROM alpine:3.22
@@ -12,5 +24,7 @@ WORKDIR /app
 ENV WORKBENCH_CONFIG=/app/configs/workbench.test.json
 COPY --from=builder /out/im_workbench /app/im_workbench
 COPY configs /app/configs
+COPY --from=web-builder /web/dist /app/web/dist
+ENV WORKBENCH_FRONTEND_DIR=/app/web/dist
 EXPOSE 6061
 ENTRYPOINT ["/app/im_workbench"]