fix: computed fields missing in anniversary endpoints + missing account_id validation in installment update

api/app/routers/anniversaries.py

@@ -219,10 +219,10 @@ def create_anniversary(data: AnniversaryCreate, db: Session = Depends(get_db)):
         db.refresh(db_anniversary)
 
         today = date.today()
-        next_date, days_until, year_count = compute_next_info(db_anniversary, today)
+        result = enrich_anniversary(db_anniversary, today)
 
         logger.info(f"创建纪念日成功: id={db_anniversary.id}, title={db_anniversary.title}")
-        return db_anniversary
+        return result
     except Exception as e:
         db.rollback()
         logger.error(f"创建纪念日失败: {str(e)}")
@@ -234,7 +234,9 @@ def get_anniversary(anniversary_id: int, db: Session = Depends(get_db)):
     """获取单个纪念日"""
     try:
         anniversary = get_or_404(db, Anniversary, anniversary_id, "纪念日")
-        return anniversary
+        today = date.today()
+        result = enrich_anniversary(anniversary, today)
+        return result
     except HTTPException:
         raise
     except Exception as e: