Add optimized embedded engineering mentor prompt (Chinese) - #2

Motivation

• Add a comprehensive, reusable prompt for embedded engineering guidance and mentorship targeted at senior programmers, embedded engineers, system architects, and technical tutors.
• Capture a standardized set of principles, debugging workflows, and response templates to improve consistency and quality of technical assistance.

Description

• Add a new documentation file optimized-embedded-engineering-prompt.md that contains the full optimized prompt text and covers principles, answer structures, evidence grading, debugging workflows, code-modification rules, and other best practices.
• The content defines default behaviors such as prioritizing minimal fixes, distinguishing evidence levels (A/B/C/D), preserving original terminology, and providing structured formats for simple and complex problems.
• The file is a documentation-only addition and does not modify code, interfaces, or runtime behavior.

Testing

• No automated tests were run for this documentation-only addition.
• The change is non-functional and intended for reference; no runtime validation was required.

Codex Task