Add X/Twitter evidence audit prompt

[kriptoburak]

Summary

• add a Simplified Chinese prompt for X/Twitter public evidence audits
• add a matching Traditional Chinese JSON prompt entry
• add the same prompt to the README copy section

Validation

• node JSON parse for prompts-zh.json and prompts-zh-TW.json
• git diff --check
• added-line public scan for badges, ranking claims, private terms, and excluded targets