fix: AI daily review sqlite3.Row crash and error feedback across four exchanges

Co-authored-by: Cursor <cursoragent@cursor.com>

crypto_monitor_okx/app.py

@@ -7757,6 +7757,7 @@ def ai_daily_review():
     text = f"【每日交易记录】{date}\n总笔数：{len(rows)}\n\n"
     for idx, row in enumerate(rows, 1):
         text += journal_row_lines_for_ai(idx, row)
+    text += "\n"
 
     image_paths = collect_images_for_ai_review(
         rows,
@@ -7792,6 +7793,7 @@ def ai_weekly_review():
     text = f"【周交易记录】{start_date}~{end_date}\n总笔数：{len(rows)}\n\n"
     for idx, row in enumerate(rows, 1):
         text += journal_row_lines_for_ai(idx, row)
+    text += "\n"
 
     image_paths = collect_images_for_ai_review(
         rows,