Add and Enhance Chinese Translation of Techniques Section

This pull request introduces improvements to the Chinese localization and documentation of prompt engineering techniques. The main updates include refining terminology for several techniques, updating the content and naming for "主动提示" (Active-Prompt), and adding a comprehensive new section for "元提示词" (Meta Prompting). These changes enhance clarity, consistency, and educational value for users learning about advanced prompting methods. **Terminology and Translation Improvements:** * Updated translations for several technique names in `pages/techniques/_meta.zh.json` to provide clearer and more consistent Chinese terminology, including "链式提示" for Prompt Chaining, "主动提示" for Active-Prompt, and "PAL（程序辅助语言模型）" for PAL. Added a new entry for "元提示词（Meta Prompting）". **Content and Documentation Enhancements:** * Revised the title and content in `pages/techniques/activeprompt.zh.mdx` to use "主动提示" consistently and clarify the explanation of the method. * Added a new, detailed section `pages/techniques/meta-prompting.zh.mdx` describing the concept, features, advantages, and application scenarios of "元提示词（Meta Prompting）", including visual examples and links to related courses. * Improved citation formatting and clarity in `pages/techniques/reflexion.zh.mdx` by updating author references and maintaining consistent terminology.