dsh-big-fish-speak: Let desktop pets announce model outputs

dsh-big-fish-speak is a DSH plugin maintained by chaowei08 that depends on dsh-pet 0.4.6+. It automatically reads the model output using the selected voice from the desktop pet's settings page. It supports the commands `/speak`, `/voice`, and `/voice test`, with a speaker icon in the top bar indicating playback status. To install, add `dsh-big-fish-speak` to the DSH plugins page. Volume and voice settings are configured on the desktop pet side, and playback cannot be stopped immediately. It is licensed under the MIT License, with the current package version being 0.7.65.