docs(code-runtime-python): fix the doc-standard registry and README kind

The audited library registry still listed dsh-code-runtime-python as a plain
protocol library, but the shipped package's src/index.ts has a plugin default
export; the entry is removed from PACKAGE_LIBRARIES and both READMEs declare
kind: package-reference. The zh README heading is 概述 per the standard.

packages/code-runtime/code-runtime-python/README.md

@@ -1,6 +1,6 @@
 ---
 description: "CPython-subprocess code runtime: the dsh-code-runtime seam implementation for Python model code, with the fd-3 wire protocol it speaks."
-kind: "package-library"
+kind: "package-reference"
 ---
 
 # @deepseek-ai/dsh-code-runtime-python