Introduce notifications app and integrate emails

Add a new notifications app (models, serializers, views, admin, tasks, consumers, routing, urls, tests) with Notification.notify for in-app websocket pushes and optional email delivery. Centralize email sending in notifications.tasks.send_email_with_context and re-export it from account.tasks for compatibility. Update account and commerce and advertisement tasks to use Notification.notify/_notify_order and the new email helper; adjust order/notification tasks to consolidate logic. Wire notifications into ASGI routing, settings and URL conf. Misc: handle OSError when importing weasyprint, add tmp/ to .gitignore, add local .claude PowerShell checks, add social.blog skeleton, and remove legacy ews-component test files.

backend/social/blog/IDEA.md

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+# editorjs.io - základ

backend/social/blog/admin.py

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+from django.contrib import admin
+
+# Register your models here.

backend/social/blog/apps.py

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+from django.apps import AppConfig
+
+
+class BlogConfig(AppConfig):
+    name = 'blog'

backend/social/blog/models.py

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+from django.db import models
+
+# Create your models here.
+
+
+class Blog(models.Model):
+    title = models.CharField(max_length=255)
+    content = models.JsonField()
+
+    authors = models.ManyToManyField('Author', related_name='blogs')
+
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    def __str__(self):
+        return self.title

backend/social/blog/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

backend/social/blog/views.py

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+from django.shortcuts import render
+
+# Create your views here.