Fix Purchase Order modal and reorganize documentation

Frontend Changes:
- Fix runtime error: Remove undefined handleModify reference from ActionQueueCard in DashboardPage
- Migrate PurchaseOrderDetailsModal to use correct PurchaseOrderItem type from purchase_orders service
- Fix item display: Parse unit_price as string (Decimal) instead of number
- Use correct field names: item_notes instead of notes
- Remove deprecated PurchaseOrder types from suppliers.ts to prevent type conflicts
- Update CreatePurchaseOrderModal to use unified types
- Clean up API exports: Remove old PO hooks re-exported from suppliers
- Add comprehensive translations for PO modal (en, es, eu)

Documentation Reorganization:
- Move WhatsApp implementation docs to docs/03-features/notifications/whatsapp/
- Move forecast validation docs to docs/03-features/forecasting/
- Move specification docs to docs/03-features/specifications/
- Move deployment docs (Colima, K8s, VPS sizing) to docs/05-deployment/
- Archive completed implementation summaries to docs/archive/implementation-summaries/
- Delete obsolete FRONTEND_CHANGES_NEEDED.md
- Standardize filenames to lowercase with hyphens

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

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

frontend/src/locales/es/purchase_orders.json

@@ -3,13 +3,57 @@
   "purchase_orders": "Órdenes de Compra",
   "created": "Creada",
   "supplier": "Proveedor",
+  "supplier_name": "Nombre del Proveedor",
   "order_date": "Fecha de Pedido",
   "expected_delivery": "Entrega Esperada",
   "items": "Artículos",
   "no_items": "No hay artículos en esta orden",
   "notes": "Notas",
+  "order_notes": "Notas de la Orden",
   "not_found": "Orden de compra no encontrada",
   "total_amount": "Monto Total",
+  "general_information": "Información General",
+  "financial_summary": "Resumen Financiero",
+  "dates": "Fechas",
+  "po_number": "Número de Orden",
+  "status_label": "Estado",
+  "quantity": "Cantidad",
+  "unit_price": "Precio Unitario",
+  "quality_requirements": "Requisitos de Calidad",
+  "total": "Total",
+  "priority": "Prioridad",
+  "required_delivery_date": "Fecha de Entrega Requerida",
+  "supplier_info": "Información del Proveedor",
+  "order_details": "Detalles de la Orden",
+  "products": "Productos",
+  "modify_order": "Modificar Orden de Compra",
+  "modifying_order": "Modificando Orden",
+  "supplier_cannot_modify": "El proveedor no puede ser modificado",
+  "adjust_priority": "Ajusta la prioridad de esta orden",
+  "delivery_deadline": "Fecha límite para la entrega",
+  "special_instructions": "Instrucciones especiales para el proveedor...",
+  "additional_info": "Información adicional o instrucciones especiales",
+  "product": "Producto",
+  "sku": "SKU",
+  "ordered_quantity": "Cantidad Pedida",
+  "unit": "Unidad",
+  "unit_price_euro": "Precio Unitario (€)",
+  "add_product": "Agregar Producto",
+  "modify_quantities": "Modifica las cantidades, unidades y precios según sea necesario",
+  "at_least_one_product": "Por favor, agrega al menos un producto",
+  "quantities_greater_zero": "Todas las cantidades deben ser mayores a 0",
+  "products_need_names": "Todos los productos deben tener un nombre",
+  "priority_urgent": "Urgente",
+  "priority_high": "Alta",
+  "priority_normal": "Normal",
+  "priority_low": "Baja",
+  "unit_kg": "Kilogramos",
+  "unit_g": "Gramos",
+  "unit_l": "Litros",
+  "unit_ml": "Mililitros",
+  "unit_units": "Unidades",
+  "unit_boxes": "Cajas",
+  "unit_bags": "Bolsas",
   "status": {
     "draft": "Borrador",
     "pending_approval": "Pendiente de Aprobación",
@@ -31,6 +75,8 @@
   "actions": {
     "approve": "Aprobar Orden",
     "modify": "Modificar Orden",
-    "close": "Cerrar"
+    "close": "Cerrar",
+    "save": "Guardar Cambios",
+    "cancel": "Cancelar"
   }
 }