feat(perl-client): 新增 Perl 客户端 SDK 及 demo，各客户端版本统一为 1.0.3

Dockerfile.perl

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+# Build stage
+FROM perl:5.40 AS build
+
+WORKDIR /src
+
+# Copy client library
+COPY kenaito-conf-perl-client/ ./kenaito-conf-perl-client/
+
+# Install client dependencies
+WORKDIR /src/kenaito-conf-perl-client
+RUN cpanm --notest HTTP::Tiny JSON::PP
+
+# Copy demo project
+WORKDIR /src
+COPY kenaito-conf-perl-client-demo/ ./kenaito-conf-perl-client-demo/
+
+# Runtime stage
+FROM perl:5.40-slim
+
+WORKDIR /app
+COPY --from=build /src/kenaito-conf-perl-client/lib /app/kenaito-conf-perl-client/lib
+COPY --from=build /src/kenaito-conf-perl-client-demo/app.pl .
+
+ENV PERL5LIB=/app/kenaito-conf-perl-client/lib
+
+ENTRYPOINT ["perl", "app.pl"]