Initial open-source release (MIT): image2api AI gateway

Full Go backend + Vue 3 frontend, OpenAI-compatible API, multi-provider
account pools, billing/admin, Docker one-command deploy with auto HTTPS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/Dockerfile

@@ -0,0 +1,24 @@
+# syntax=docker/dockerfile:1
+
+# --- Stage 1: build the Go binary from source ---
+FROM golang:1.26-alpine AS build
+WORKDIR /src
+RUN apk add --no-cache git
+# Cache deps first for faster rebuilds.
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/api ./cmd/api
+
+# --- Stage 2: minimal runtime image ---
+FROM alpine:3.20
+# ca-certificates: outbound HTTPS to the AI providers. tzdata: POSTGRES_DSN sets
+# TimeZone=Asia/Shanghai. wget: container healthcheck.
+RUN apk add --no-cache ca-certificates tzdata wget
+WORKDIR /app
+COPY --from=build /out/api /app/api
+# Local fallback for generated media / reference uploads (RustFS/S3 is primary).
+RUN mkdir -p /app/data/generated && chmod +x /app/api
+ENV HTTP_ADDR=0.0.0.0:6666
+EXPOSE 6666
+ENTRYPOINT ["/app/api"]