feat: Translate various strings and comments to Spanish for better localization

- Updated error messages and comments in main.rs, openapi.rs, portfolio.rs, predictive.rs, ai.rs, health.rs, middleware.rs, models.rs, token_limits.rs, and webhooks.rs to Spanish.
- Enhanced user experience by providing localized content for Spanish-speaking users.

services/lms-service/src/db_util.rs

@@ -24,7 +24,7 @@ pub async fn set_session_context(
             .await?;
     }
     if let Some(user_agent) = ua {
-        // Use set_config for potentially long strings to avoid SQL injection/formatting issues
+        // Usar set_config para cadenas potencialmente largas para evitar inyección SQL o problemas de formato
         sqlx::query("SELECT set_config('app.user_agent', $1, true)")
             .bind(user_agent)
             .execute(&mut **tx)