v1.17 Deepseek support, copy buttons, and summary fixes

Update your image with:

docker pull promptpanel/promptpanel:1.17

and then re-create your container.

Features:

• Deepseek support (via API) in Universal LLM model [also available via Ollama locally via: deepseek-v2 and deepseek-coder-v2].
• Copy button for code snippets.

Enhancements:

• Summary Plugin: Fix for streaming support / simplification.
• Made default models more resilient for aliases.
• Tweaks to code display.
• Requirements bump LiteLLM.