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.

backend/social/chat/IDEA.md

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+# Notify requests for chats
+
+# Notify @mentions in chats
+
+# Add requests before filling chat (maybe add chat type request and allowed and archived for advanced filtering) + actions
+

backend/social/chat/chat app diagram.md

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-chat app diagram
-┌─────────────────────────────────────────────────────────────────┐
-│                        CLIENT (browser)                         │
-└────────────┬────────────────────────────┬───────────────────────┘
-             │ WebSocket                  │ HTTP REST
-             │ ws/chat/<id>/              │ /api/social/
-             ▼                            ▼
-┌────────────────────────┐   ┌────────────────────────────────────┐
-│    ChatConsumer        │   │         REST Views                 │
-│  (consumers.py)        │   │         (views.py)                 │
-│                        │   │                                    │
-│  connect()             │   │  ChatViewSet                       │
-│  ├─ auth check         │   │  ├─ list / retrieve    (GET)       │
-│  └─ membership check ──┼───┼──► IsChatMember                    │
-│                        │   │  ├─ create             (POST)      │
-│  receive()             │   │  ├─ update/partial     (PATCH/PUT) │
-│  ├─ new_chat_message   │   │  │   └─ CanManageChat              │
-│  │  (text only)        │   │  ├─ destroy            (DELETE)    │
-│  │   └─► _create_message   │  │   └─ CanManageChat              │
-│  │         (DB INSERT) │   │  └─ add/remove member & moderator  │
-│  │                     │   │                                    │
-│  ├─ new_reply_message  │   │  MessageViewSet                    │
-│  │  (text only)        │   │  ├─ list / retrieve    (GET)       │
-│  │   └─► _create_message   │  │   └─ IsAuthenticated            │
-│  │         (DB INSERT) │   │  ├─ send              (POST)       │
-│  │                     │   │  │   ├─ IsAuthenticated            │
-│  └─ reaction           │   │  │   ├─ DB INSERT Message          │
-│      └─► _toggle_reaction  │  │   ├─ DB INSERT MessageFile(s)   │
-│            (DB UPDATE/ │   │  │   └─► group_send(chat.msg) ─────┼──► WebSocket push
-│             DELETE)    │   │  ├─ update/partial     (PATCH/PUT) │
-│                        │   │  │   ├─ IsMessageSenderOnly        │
-│  typing / stop_typing  │   │  │   ├─ message.edit_content()     │
-│  └─► group_send only   │   │  │   └─► group_send(edit.msg) ─────┼──► WebSocket push
-│      (no DB write)     │   │  └─ destroy            (DELETE)    │
-│                        │   │      ├─ CanDeleteMessage           │
-│                        │   │      └─► group_send(delete.msg) ───┼──► WebSocket push
-└────────────┬───────────┘   └──────────────┬─────────────────────┘
-             │                              │
-             │  both use channel_layer      │
-             ▼                              ▼
-┌─────────────────────────────────────────────────────────────────┐
-│                    Channel Layer (Redis)                        │
-│                   group: "chat_{id}"                            │
-└─────────────────────────────────────────────────────────────────┘
-             │
-             ▼  group_send dispatches to all connected consumers
-┌─────────────────────────────────────────────────────────────────┐
-│  ChatConsumer event handlers (push to each connected client)    │
-│  chat_message · reply_chat_message · edit_message               │
-│  delete_message · message_reaction · typing_status · stop_typing│
-└─────────────────────────────────────────────────────────────────┘
-
-┌──────────────────────────────────┐   ┌──────────────────────────┐
-│  Database writes summary         │   │  When to use which path  │
-│                                  │   │                          │
-│  CREATE  Message  ← consumer     │   │  WS  ← text-only msg     │
-│                      (text only) │   │  HTTP← msg with files    │
-│  CREATE  Message  ← view /send   │   │  HTTP← edit message      │
-│                      (any)       │   │  HTTP← delete message    │
-│  CREATE  MessageFile ← view/send │   │  WS  ← reaction          │
-│  UPDATE  Message  ← view         │   │  WS  ← typing indicator  │
-│  DELETE  Message  ← view (soft)  │   └──────────────────────────┘
-│  CREATE  MessageReaction ← cons  │
-│  UPDATE  MessageReaction ← cons  │
-│  DELETE  MessageReaction ← cons  │
-│  CREATE  MessageHistory  ← model │
-│          (auto on edit_content)  │
-└──────────────────────────────────┘

backend/social/hubs/IDEA.md

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+# Notify on mod ADD
+
+# notify for Apeal

backend/social/posts/IDEA.md

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+# Votes in posts as widget
+
+# Location tag
+
+# PFP from hub on posts outside of hub
+
+# Collab/multiple authors on posts
+
+# NSFW tag, spoiler tag
+
+# Notify on likes 1 --> 10 --> 100 -> 500 -> 1000 etc..