Add PromptTrace to Workshops and Labs

[K4r1it0]

Summary

• Adds PromptTrace to the Learning Resources > Workshops and Labs section.
• PromptTrace is an interactive AI security training platform featuring 7 attack labs, a 15-level Gauntlet, and real-time Context Trace for hands-on practice with prompt injection, defense bypass, and tool abuse against real LLMs.

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