Refactor frontend components and backend migrations

- Removed TradingGraph component from frontend/src/components/trading.
- Updated home page to import Services component and TradingGraph from new path.
- Modified PortfolioPage to return null instead of PortfolioGrid.
- Added initial migrations for account, advertisement, commerce, configuration, downloader, gopay, stripe, trading212, and zasilkovna apps in the backend.
- Created Services component with subcomponents for Kinematografie, Drone Service, and Website Service.
- Implemented TradingGraph component with dynamic data generation and canvas rendering.
- Updated DonationShop component to display donation tiers with icons and descriptions.

backend/commerce/admin.py

@@ -1,14 +1,82 @@
 from django.contrib import admin
-from .models import Carrier, Product
-# Register your models here.
+from .models import (
+    Category, Product, ProductImage, Order, OrderItem, 
+    Carrier, Payment, DiscountCode, Refund, Invoice
+)
 
 
-@admin.register(Carrier)
-class CarrierAdmin(admin.ModelAdmin):
-    list_display = ("name", "base_price", "is_active")
+@admin.register(Category)
+class CategoryAdmin(admin.ModelAdmin):
+    list_display = ("name", "url", "parent")
+    search_fields = ("name", "description")
+    prepopulated_fields = {"url": ("name",)}
 
 
 @admin.register(Product)
 class ProductAdmin(admin.ModelAdmin):
-    list_display = ("name", "price", "currency", "stock", "is_active")
-    search_fields = ("name", "description")
+    list_display = ("name", "price", "stock", "is_active", "category", "created_at")
+    search_fields = ("name", "description", "code")
+    list_filter = ("is_active", "category", "created_at")
+    prepopulated_fields = {"url": ("name",)}
+
+
+@admin.register(ProductImage)
+class ProductImageAdmin(admin.ModelAdmin):
+    list_display = ("product", "is_main", "alt_text")
+    list_filter = ("is_main",)
+    search_fields = ("product__name", "alt_text")
+
+
+class OrderItemInline(admin.TabularInline):
+    model = OrderItem
+    extra = 0
+    readonly_fields = ("product", "quantity")
+
+
+@admin.register(Order)
+class OrderAdmin(admin.ModelAdmin):
+    list_display = ("id", "user", "email", "status", "total_price", "currency", "created_at")
+    list_filter = ("status", "created_at", "country")
+    search_fields = ("email", "first_name", "last_name", "phone")
+    readonly_fields = ("created_at", "updated_at", "total_price")
+    inlines = [OrderItemInline]
+
+
+@admin.register(OrderItem)
+class OrderItemAdmin(admin.ModelAdmin):
+    list_display = ("order", "product", "quantity")
+    search_fields = ("order__id", "product__name")
+
+
+@admin.register(Carrier)
+class CarrierAdmin(admin.ModelAdmin):
+    list_display = ("id", "shipping_method", "state", "shipping_price", "weight")
+    list_filter = ("shipping_method", "state", "returning")
+    search_fields = ("id",)
+
+
+@admin.register(Payment)
+class PaymentAdmin(admin.ModelAdmin):
+    list_display = ("id", "payment_method", "created_at")
+    list_filter = ("payment_method", "created_at")
+
+
+@admin.register(DiscountCode)
+class DiscountCodeAdmin(admin.ModelAdmin):
+    list_display = ("code", "percent", "amount", "active", "valid_from", "valid_to", "used_count", "usage_limit")
+    list_filter = ("active", "valid_from", "valid_to")
+    search_fields = ("code", "description")
+
+
+@admin.register(Refund)
+class RefundAdmin(admin.ModelAdmin):
+    list_display = ("order", "reason_choice", "verified", "created_at")
+    list_filter = ("verified", "reason_choice", "created_at")
+    search_fields = ("order__id", "order__email", "reason_text")
+
+
+@admin.register(Invoice)
+class InvoiceAdmin(admin.ModelAdmin):
+    list_display = ("invoice_number", "issued_at", "due_date")
+    search_fields = ("invoice_number",)
+    readonly_fields = ("issued_at",)