refactor: complete module-driven architecture migration

This commit completes the migration to a fully module-driven architecture:

## Models Migration
- Moved all domain models from models/database/ to their respective modules:
  - tenancy: User, Admin, Vendor, Company, Platform, VendorDomain, etc.
  - cms: MediaFile, VendorTheme
  - messaging: Email, VendorEmailSettings, VendorEmailTemplate
  - core: AdminMenuConfig
- models/database/ now only contains Base and TimestampMixin (infrastructure)

## Schemas Migration
- Moved all domain schemas from models/schema/ to their respective modules:
  - tenancy: company, vendor, admin, team, vendor_domain
  - cms: media, image, vendor_theme
  - messaging: email
- models/schema/ now only contains base.py and auth.py (infrastructure)

## Routes Migration
- Moved admin routes from app/api/v1/admin/ to modules:
  - menu_config.py -> core module
  - modules.py -> tenancy module
  - module_config.py -> tenancy module
- app/api/v1/admin/ now only aggregates auto-discovered module routes

## Menu System
- Implemented module-driven menu system with MenuDiscoveryService
- Extended FrontendType enum: PLATFORM, ADMIN, VENDOR, STOREFRONT
- Added MenuItemDefinition and MenuSectionDefinition dataclasses
- Each module now defines its own menu items in definition.py
- MenuService integrates with MenuDiscoveryService for template rendering

## Documentation
- Updated docs/architecture/models-structure.md
- Updated docs/architecture/menu-management.md
- Updated architecture validation rules for new exceptions

## Architecture Validation
- Updated MOD-019 rule to allow base.py in models/schema/
- Created core module exceptions.py and schemas/ directory
- All validation errors resolved (only warnings remain)

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

app/modules/orders/locales/de.json

@@ -1 +1,50 @@
-{}
+{
+  "orders": {
+    "title": "Bestellungen",
+    "order": "Bestellung",
+    "order_id": "Bestellnummer",
+    "order_number": "Bestellnummer",
+    "order_date": "Bestelldatum",
+    "order_status": "Bestellstatus",
+    "order_details": "Bestelldetails",
+    "order_items": "Bestellartikel",
+    "order_total": "Bestellsumme",
+    "subtotal": "Zwischensumme",
+    "shipping": "Versand",
+    "tax": "Steuer",
+    "discount": "Rabatt",
+    "customer": "Kunde",
+    "shipping_address": "Lieferadresse",
+    "billing_address": "Rechnungsadresse",
+    "payment_method": "Zahlungsmethode",
+    "payment_status": "Zahlungsstatus",
+    "tracking": "Sendungsverfolgung",
+    "tracking_number": "Sendungsnummer",
+    "carrier": "Versanddienstleister",
+    "no_orders": "Keine Bestellungen gefunden",
+    "search_orders": "Bestellungen suchen...",
+    "filter_by_status": "Nach Status filtern",
+    "status_pending": "Ausstehend",
+    "status_processing": "In Bearbeitung",
+    "status_shipped": "Versendet",
+    "status_delivered": "Zugestellt",
+    "status_cancelled": "Storniert",
+    "status_refunded": "Erstattet",
+    "status_confirmed": "Bestätigt",
+    "status_rejected": "Abgelehnt",
+    "confirm_order": "Bestellung bestätigen",
+    "reject_order": "Bestellung ablehnen",
+    "set_tracking": "Sendungsverfolgung setzen",
+    "view_details": "Details ansehen"
+  },
+  "messages": {
+    "order_status_updated": "Order status updated",
+    "item_shipped_successfully": "Item shipped successfully",
+    "all_items_shipped": "All items shipped",
+    "invoice_downloaded": "Invoice downloaded",
+    "failed_to_load_order_details": "Failed to load order details.",
+    "order_status_updated_successfully": "Order status updated successfully.",
+    "order_marked_as_shipped_successfully": "Order marked as shipped successfully.",
+    "no_shipping_label_url_available_for_this": "No shipping label URL available for this order."
+  }
+}