feat: add Docker deployment, update install script, and project configs

- Add Dockerfile and docker-compose.yml for containerized deployment
- Rewrite install.sh for Docker-based setup (multi-distro support)
- Add Go module files (go.mod, go.sum) for WGRplane backend
- Add wgrplane.service systemd unit for Go backend
- Add CI verification scripts in scripts/
- Update README.md with Docker deployment docs
- Update .gitignore for binaries and .sisyphus/

Dockerfile

@@ -0,0 +1,29 @@
+## Multi-stage Dockerfile for WGRplane
+## Stage 1: Go backend build
+FROM --platform=$BUILDPLATFORM golang:1.21-alpine AS builder-go
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    go mod download
+COPY app ./app
+ENV CGO_ENABLED=0
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+    go build -o /bin/wgrplane ./app
+
+## Stage 2: Frontend build (Vue 3)
+FROM node:20-alpine AS frontend-builder
+WORKDIR /src/app/frontend
+COPY app/frontend/package*.json ./
+RUN npm ci
+COPY app/frontend/ .
+RUN npm run build
+
+## Stage 3: Production image
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+WORKDIR /root
+COPY --from=builder-go /bin/wgrplane /usr/local/bin/wgrplane
+COPY --from=frontend-builder /src/app/frontend/dist /var/www/frontend
+ENV APP_FRONTEND_DIR=/var/www/frontend
+EXPOSE 10087
+ENTRYPOINT ["/usr/local/bin/wgrplane"]