feat: first commit

Dockerfile

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+# syntax=docker/dockerfile:1
+#
+# One image, three commands. docker-compose runs it three times with different
+# entrypoints (api / frontend / redirect). See docker-compose.yml.
+
+# --- 1. Build the SPA -------------------------------------------------------
+FROM node:20-alpine AS frontend
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm ci 2>/dev/null || npm install
+COPY index.html vite.config.ts tsconfig*.json postcss.config.js tailwind.config.js ./
+COPY src ./src
+COPY public ./public
+RUN npm run build   # -> /app/dist
+
+# --- 2. Build the Go binary -------------------------------------------------
+FROM golang:1.25-alpine AS backend
+WORKDIR /src
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend/ .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/snip ./cmd/snip
+
+# --- 3. Minimal runtime -----------------------------------------------------
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates wget && adduser -D -u 10001 snip
+WORKDIR /app
+COPY --from=backend /out/snip /usr/local/bin/snip
+COPY --from=frontend /app/dist ./web
+ENV FRONTEND_DIST=/app/web
+USER snip
+# Default command; compose overrides with api / frontend / redirect.
+ENTRYPOINT ["snip"]
+CMD ["api"]