restructure: console→client-console, add admin-console skeleton, move docs to doc/

admin-console/Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.26-alpine AS builder
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o admin-console ./cmd/server/
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates
+COPY --from=builder /build/admin-console /admin-console
+COPY ui/ /ui/
+EXPOSE 8091
+ENTRYPOINT ["/admin-console"]