Initial commit: email-openclaw bridge v1

Full pipeline: IMAP ingress -> OpenClaw dispatch -> callback -> SMTP reply.
SQLite stateful storage with idempotency, threading, and retry logic.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile

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+# ---- Build stage ----
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /src
+
+# Cache module downloads.
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+# CGO disabled — using modernc.org/sqlite (pure Go).
+RUN CGO_ENABLED=0 go build -o /app/bridge ./cmd/bridge
+
+# ---- Runtime stage ----
+FROM alpine:3.20
+
+RUN apk add --no-cache ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=builder /app/bridge .
+
+# Ensure data directory exists for SQLite volume mount.
+RUN mkdir -p /app/data
+
+EXPOSE 8080
+
+ENTRYPOINT ["./bridge"]