chore: merge backend repo history into monorepo at backend/

git-subtree-dir: backend
git-subtree-mainline: dc11190527
git-subtree-split: acae976622

backend/Dockerfile

@@ -0,0 +1,27 @@
+# ---- مرحله‌ی build ----
+FROM golang:1.22-alpine AS builder
+WORKDIR /app
+
+RUN sed -i 's|dl-cdn.alpinelinux.org|mirror.mobinhost.com|g' /etc/apk/repositories
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /out/server ./cmd/api
+
+# ---- مرحله‌ی اجرا (ایمیج نهایی سبک) ----
+FROM alpine:3.20
+
+RUN sed -i 's|dl-cdn.alpinelinux.org|mirror.mobinhost.com|g' /etc/apk/repositories \
+    && apk add --no-cache ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=builder /out/server ./server
+RUN chmod +x /app/server
+
+RUN mkdir -p /app/uploads/photos
+
+EXPOSE 8080
+ENTRYPOINT ["./server"]