docs: restore the Run section heading and retarget guide links
Split the quickstart into a Run section with a Run from npm subsection,
mirror it in the Chinese pair, and point the Web UI guide and providers
docs back at the #run anchor.
-Start the Web UI through the [root README](../../../README.md#run-from-npm); the command prints its URL. This guide begins after that server is running.
+Start the Web UI through the [root README](../../../README.md#run); the command prints its URL. This guide begins after that server is running.
The invoking directory is the default workspace, so the agent can inspect and modify the project where you started `dsh`.
-This guide assumes you started the Web UI through the [root README](../../../README.md#run-from-npm). Model changes take effect on the next request without restarting the server.
+This guide assumes you started the Web UI through the [root README](../../../README.md#run). Model changes take effect on the next request without restarting the server.