optimize and add new service of get report and download report.

controllers/gst_release_controller.py

@@ -1,10 +1,10 @@
+# routes/gst_release_routes.py
 from flask import Blueprint, render_template, request, redirect, url_for, flash
 from flask_login import login_required
 from model.gst_release import GSTRelease
 from model.Log import LogHelper
 
 gst_release_bp = Blueprint('gst_release_bp', __name__)
-
 gst_service = GSTRelease()
 
 # ---------------- ADD GST RELEASE ----------------