deployment improved

Dockerfile

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+# Stage 1: Frontend bauen
+FROM node:22-slim AS frontend-builder
+WORKDIR /app/frontend
+RUN corepack enable
+COPY frontend/package.json frontend/pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY frontend/ ./
+RUN pnpm build
+
+# Stage 2: Go-Binary bauen (CGO nötig für go-sqlite3)
+FROM golang:1.24-bookworm AS go-builder
+WORKDIR /app
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend/ ./
+# Frontend-Build in static/ einhängen (wird per embed eingebettet)
+COPY --from=frontend-builder /app/frontend/dist/ ./static/
+RUN CGO_ENABLED=1 go build -ldflags="-s -w" -o krafttrainer ./cmd/server
+
+# Stage 3: Minimales Runtime-Image
+FROM debian:bookworm-slim
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# DB landet im Volume /data (hardcodierter Pfad "krafttrainer.db" → WORKDIR)
+WORKDIR /data
+COPY --from=go-builder /app/krafttrainer /usr/local/bin/krafttrainer
+
+EXPOSE 8090
+CMD ["krafttrainer"]