chore: initial import from sless/shared-sqs (v0.1.14)

- Standalone SQS-service repository
- Multi-tenant message queue service, AWS SQS compatible
- Based on GoAws, with mutable tenants, auth, WebUI, Redis persistence
- Ready for independent development and deployment
- See doc/ and README.md for architecture and usage

Dockerfile

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+# Dockerfile — shared-sqs multi-stage build
+# Updated: 2026-04-09
+
+FROM golang:1.22-alpine AS builder
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -o shared-sqs ./app/cmd/
+
+FROM alpine:3.19
+RUN apk --no-cache add ca-certificates
+COPY --from=builder /build/shared-sqs /usr/local/bin/shared-sqs
+COPY --from=builder /build/app/conf/goaws.yaml /conf/goaws.yaml
+EXPOSE 4100
+HEALTHCHECK --interval=10s --timeout=5s --retries=3 \
+  CMD wget -q -O - http://localhost:4100/health || exit 1
+ENTRYPOINT ["shared-sqs", "--config", "/conf/goaws.yaml"]