feat(bash-env): extract the shared DSH_* environment registry into its own package

python/sdk-runtime/package.json

@@ -14,6 +14,7 @@
     "@deepseek-ai/dsh-agent-spine-demo": "workspace:^",
     "@deepseek-ai/dsh-app-boot": "workspace:^",
     "@deepseek-ai/dsh-bash": "workspace:^",
+    "@deepseek-ai/dsh-bash-env": "workspace:^",
     "@deepseek-ai/dsh-bash-local": "workspace:^",
     "@deepseek-ai/dsh-brand": "workspace:^",
     "@deepseek-ai/dsh-code-runtime": "workspace:^",