refactor: apply repository naming contract

Apply the accepted pre-release package, service, type, directory, and role renames as one repository-wide change.

python/sdk-runtime/src/deepseek_harness_runtime/__init__.py

@@ -9,7 +9,7 @@ Two runtime carriers coexist under ``runtime/``, both injected by the repo's
   needs no Node installation.
 - **node (dev-only)**: the full deploy closure under ``runtime/node/``
   (``package.json`` + ``node_modules/``), executed as ``node
-  runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/packaged-bin.js`` on a
+  runtime/node/node_modules/@deepseek-ai/dsh-sdk-jsonrpc-demo/lib/packaged-bin.js`` on a
   system Node >= 22.19. It is the current checkout's source build, never
   selected automatically, and excluded from wheel/sdist distributions.
 
@@ -134,7 +134,7 @@ def _node_launch_args() -> tuple[str, str]:
         node_root
         / "node_modules"
         / "@deepseek-ai"
-        / "dsh-jsonrpc-demo"
+        / "dsh-sdk-jsonrpc-demo"
         / "lib"
         / "packaged-bin.js"
     )