✏️ [fix] 마크다운 문법 적용범위 수정에 따른 프롬프트 수정

Author: khyaejin

src/main/java/com/going/server/domain/openai/service/TextSummaryCreateService.java

@@ -34,7 +34,6 @@ public class TextSummaryCreateService {
         - Use Markdown formatting actively:
           - Use `###` for headings, `**bold**` for emphasis, `-`, `1.` etc. for sublists
           - Use `---` for section separation
-          - Use `<details><summary>💡 Notes</summary>...</details>` to collapse additional info
         - Only use the following emojis:  
           📍🖇💡⚙🔧🔍📑✔💭✨
         - **Respond only in Korean**, and **output the summary only**, without any extra commentary.