feat(deploy): dev/prod Dockerfiles in service dirs (backend/,web/), templates live beside rendered outputs, entrypoint copies /etc/booklib conf before resolver injection

backend/Dockerfile.dev

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+FROM golang:1.26 AS base
+WORKDIR /app
+
+FROM base AS dev
+# 源码由 compose 挂载进 /app;镜像只带工具链 + delve
+RUN go install github.com/go-delve/delve/cmd/dlv@latest
+EXPOSE 8080 2345
+CMD ["sh", "-c", "go mod download && dlv debug ./cmd/server --headless --listen=0.0.0.0:2345 --api-version=2 --continue --log"]

backend/Dockerfile.prod

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+FROM golang:1.26-alpine AS build
+WORKDIR /src
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend/ ./
+RUN CGO_ENABLED=0 go build -trimpath -o /server ./cmd/server
+
+FROM alpine:3.20 AS runner
+RUN adduser -D -H app
+COPY --from=build /server /server
+# /data/books 由宿主 bind(./api/storage)覆盖;/data 下目录预建并授权,兼容 podman
+RUN mkdir -p /data && chown app:app /data
+USER app
+EXPOSE 8080
+ENTRYPOINT ["/server"]