Initial commit: CarrotAssistant backend (Go + Gin + SQLite, OpenAI-compatible agent runtime)

Dockerfile

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+# Multi-stage build for the CarrotAssistant backend.
+#
+# The cgo SQLite driver requires gcc in the build image; the final image is
+# Debian-based (slim) and ships only the compiled binary plus ca-certificates
+# for outbound HTTPS to model providers and target sites.
+
+FROM golang:1.26-bookworm AS builder
+WORKDIR /src
+# Cache deps first.
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+# CGO_ENABLED=1 is required by go-sqlite3.
+RUN CGO_ENABLED=1 GOOS=linux go build -trimpath -ldflags='-s -w' -o /out/carrot ./cmd/server
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY --from=builder /out/carrot /usr/local/bin/carrot
+# Persistent state (sqlite db + skill markdown) lives under /data and is
+# expected to be a mounted volume.
+ENV DATA_DIR=/data
+EXPOSE 8080
+ENTRYPOINT ["carrot"]