feat: Add Telegram chat ID to ShopModel for automatic invoice sending

chore: Update Dockerfile to install WeasyPrint dependencies

feat: Enhance ShopOrderModelAdmin with invoice download buttons

feat: Implement invoice generation for OrderModel and ShopOrderModel

feat: Send invoice to shop's Telegram chat upon ShopOrderModel creation

feat: Create Celery task to send shop order invoice via Telegram

feat: Add invoice download endpoints for OrderModel and ShopOrderModel

feat: Implement views for downloading order and shop order invoices

chore: Update requirements.txt to include necessary packages for PDF generation

feat: Create HTML templates for order and shop order invoices

backend/dockerfile

@@ -5,8 +5,18 @@ ENV PYTHONUNBUFFERED 1
 
 WORKDIR /app
 
+# Install system dependencies for WeasyPrint
+RUN apt-get update && apt-get install -y \
+    libcairo2 \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libgdk-pixbuf-2.0-0 \
+    libffi-dev \
+    shared-mime-info \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY requirements.txt /app/
-RUN pip install -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . /app/