dsh-vscode-runner: Run VS Code launch configurations in DSH Web UI

Maintained by sinvacn, the DSH client plugin brings VS Code's launch.json, tasks.json, and .code-workspace directories into the DSH Web UI. It supports single folder and multi-root workspaces, VS Code variable substitution, preLaunchTask and dependsOn chains, stdin and real-time output, Flutter device selection, and exposes vscode_launch for chat-side invocation. The article provides official installation commands, usage for the chat interface and runs view, a comparison table of launch types, workspace discovery order, and security notes.