feat: add launch readiness features for OMS

- Implement VAT tax calculation on order creation based on EU country rates
- Add post-order hooks: customer stats update, cart clear, email confirmation
- Create shop order history page with pagination and status badges
- Create shop order detail page with order items and addresses
- Add order_confirmation email templates in 4 languages (en, fr, de, lb)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/order_service.py

@@ -18,6 +18,7 @@ See docs/architecture/money-handling.md for details.
 import logging
 import random
 import string
+from decimal import Decimal
 from datetime import UTC, datetime
 from typing import Any
 
@@ -37,6 +38,38 @@ from app.services.subscription_service import (
     TierLimitExceededException,
 )
 from app.utils.money import Money, cents_to_euros, euros_to_cents
+
+# EU VAT rates by country code (2024 standard rates)
+# Duplicated from invoice_service to avoid circular imports
+EU_VAT_RATES: dict[str, Decimal] = {
+    "AT": Decimal("20.00"),  # Austria
+    "BE": Decimal("21.00"),  # Belgium
+    "BG": Decimal("20.00"),  # Bulgaria
+    "HR": Decimal("25.00"),  # Croatia
+    "CY": Decimal("19.00"),  # Cyprus
+    "CZ": Decimal("21.00"),  # Czech Republic
+    "DK": Decimal("25.00"),  # Denmark
+    "EE": Decimal("22.00"),  # Estonia
+    "FI": Decimal("24.00"),  # Finland
+    "FR": Decimal("20.00"),  # France
+    "DE": Decimal("19.00"),  # Germany
+    "GR": Decimal("24.00"),  # Greece
+    "HU": Decimal("27.00"),  # Hungary
+    "IE": Decimal("23.00"),  # Ireland
+    "IT": Decimal("22.00"),  # Italy
+    "LV": Decimal("21.00"),  # Latvia
+    "LT": Decimal("21.00"),  # Lithuania
+    "LU": Decimal("17.00"),  # Luxembourg (standard)
+    "MT": Decimal("18.00"),  # Malta
+    "NL": Decimal("21.00"),  # Netherlands
+    "PL": Decimal("23.00"),  # Poland
+    "PT": Decimal("23.00"),  # Portugal
+    "RO": Decimal("19.00"),  # Romania
+    "SK": Decimal("20.00"),  # Slovakia
+    "SI": Decimal("22.00"),  # Slovenia
+    "ES": Decimal("21.00"),  # Spain
+    "SE": Decimal("25.00"),  # Sweden
+}
 from models.database.customer import Customer
 from models.database.marketplace_product import MarketplaceProduct
 from models.database.marketplace_product_translation import MarketplaceProductTranslation
@@ -87,6 +120,50 @@ class OrderService:
 
         return order_number
 
+    # =========================================================================
+    # Tax Calculation
+    # =========================================================================
+
+    def _calculate_tax_for_order(
+        self, subtotal_cents: int, shipping_country_iso: str
+    ) -> tuple[int, Decimal]:
+        """
+        Calculate tax amount for an order based on shipping destination.
+
+        Uses EU VAT rates based on destination country. For B2C orders,
+        the tax is included in the product price, but we need to calculate
+        the tax component for reporting.
+
+        For Luxembourg vendors selling to EU countries:
+        - LU domestic: 17% VAT
+        - Other EU countries: destination country VAT rate
+        - Non-EU: 0% (VAT exempt)
+
+        Args:
+            subtotal_cents: Order subtotal in cents (before tax)
+            shipping_country_iso: ISO 2-letter country code
+
+        Returns:
+            tuple: (tax_amount_cents, vat_rate)
+        """
+        country = shipping_country_iso.upper() if shipping_country_iso else "LU"
+
+        # Get VAT rate for destination country (0% if non-EU)
+        vat_rate = EU_VAT_RATES.get(country, Decimal("0.00"))
+
+        if vat_rate == Decimal("0.00"):
+            return 0, vat_rate
+
+        # Calculate tax: tax = subtotal * (rate / 100)
+        # Using Decimal for precision, then converting to cents
+        subtotal_decimal = Decimal(str(subtotal_cents))
+        tax_decimal = subtotal_decimal * (vat_rate / Decimal("100"))
+
+        # Round to nearest cent
+        tax_amount_cents = int(round(tax_decimal))
+
+        return tax_amount_cents, vat_rate
+
     # =========================================================================
     # Placeholder Product Management
     # =========================================================================
@@ -369,7 +446,9 @@ class OrderService:
                 )
 
             # Calculate totals in cents
-            tax_amount_cents = 0  # TODO: Implement tax calculation
+            tax_amount_cents, vat_rate = self._calculate_tax_for_order(
+                subtotal_cents, order_data.shipping_address.country_iso
+            )
             shipping_amount_cents = 599 if subtotal_cents < 5000 else 0  # €5.99 / €50
             discount_amount_cents = 0
             total_amount_cents = Money.calculate_order_total(