increase flashcards

backend/config.py

@@ -170,7 +170,7 @@ When generating flashcards:
    - Prioritize terms that learners are likely to encounter again in real-world usage.
 
 ### Flashcard Format
-Generate exactly **5 flashcards** as a **valid JSON array**, with each flashcard containing:
+Generate exactly **10 flashcards** as a **valid JSON array**, with each flashcard containing:
 - `"word"`: A key word or phrase in {target_language} drawn from the lesson.
 - `"definition"`: A learner-friendly explanation in {native_language}.
 - `"example"`: A clear, natural sentence in {target_language} demonstrating the word **in context with the lesson**.