feat(examples): DeepSeek API + Memtrace cookbook

[xe-nvdk]

Summary

Example showing how to use Memtrace with the DeepSeek API. Since DeepSeek uses an OpenAI-compatible API, this demonstrates using the OpenAI Python SDK with a custom base_url pointing to DeepSeek.

Scope

• Short example referencing the OpenAI cookbook for the full pattern
• Standalone in examples/deepseek/ directory

Dependencies

• Requires: Python SDK (feat(sdk): Python SDK #4)
• References: OpenAI API example (feat(examples): OpenAI API + Memtrace cookbook #12)