Add weekly new products email and related features

Introduces a weekly summary email for newly added products, including a new email template and Celery periodic task. Adds 'include_in_week_summary_email' to Product and 'newsletter' to CustomUser. Provides an admin endpoint to manually trigger the weekly email, updates Celery Beat schedule, and adds email templates for verification and password reset.

backend/advertisement/tasks.py

@@ -1,9 +1,13 @@
+from venv import create
 from account.tasks import send_email_with_context
 from configuration.models import SiteConfiguration
 
 from celery import shared_task
 from celery.schedules import crontab
 
+from commerce.models import Product
+import datetime
+
 @shared_task
 def send_contact_me_email_task(client_email, message_content):
     context = {
@@ -18,13 +22,28 @@ def send_contact_me_email_task(client_email, message_content):
     )
 
 
-def send_newly_added_items_to_store_email_task_last_week(item_id):
+@shared_task
+def send_newly_added_items_to_store_email_task_last_week():
+    last_week_date = datetime.datetime.now() - datetime.timedelta(days=7)
+
+    """
+    __lte -> Less than or equal
+    __gte -> Greater than or equal
+    __lt -> Less than
+    __gt -> Greater than
+    """
+
+    products_of_week = Product.objects.filter(
+        include_in_week_summary_email=True,
+        created_at__gte=last_week_date
+    )
     
     send_email_with_context(
         recipients=SiteConfiguration.get_solo().contact_email,
         subject="Nový produkt přidán do obchodu",
-        template_path="email/new_item_added.html",
+        template_path="email/advertisement/commerce/new_items_added_this_week.html",
         context={
-            "item": item,
+            "products_of_week": products_of_week,
         }
-    )
+    )
+