Initial AI service skeleton

Dockerfile

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+FROM golang:1.25-alpine AS builder
+
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY cmd ./cmd
+COPY internal ./internal
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /out/ai-service ./cmd/server
+
+FROM alpine:3.22
+
+RUN apk add --no-cache ca-certificates tini
+
+WORKDIR /app
+COPY --from=builder /out/ai-service /usr/local/bin/ai-service
+
+EXPOSE 8080
+
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["/usr/local/bin/ai-service"]