dsh-enter-send: Remap the send keybinding for the DSH chat input box

The `dsh-enter-send` plugin allows users to customize the behavior of the Enter key in the chat input box, supporting switching between "Send on Enter" and "Send on Ctrl+Enter" modes. It adds a "Send Shortcut" option to the settings page, ensures that Shift+Enter always inserts a new line, and is compatible with Chinese input methods. Installation requires dsh version 0.1.2-rc.1 or later, using the command `dsh plugin --profile web add github:Nalleyer/dsh-enter-send`. During installation, pay attention to pnpm version compatibility and build permission issues.