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/api/services/purchase_orders.ts

@@ -123,6 +123,40 @@ export interface PurchaseOrderUpdateData {
   internal_notes?: string;
 }
 
+export interface PurchaseOrderItemCreate {
+  inventory_product_id: string;
+  ordered_quantity: number;
+  unit_price: string; // Decimal as string
+  unit_of_measure: string;
+  quality_requirements?: string;
+  item_notes?: string;
+}
+
+export interface PurchaseOrderCreateData {
+  supplier_id: string;
+  required_delivery_date?: string;
+  priority?: PurchaseOrderPriority;
+  tax_amount?: number;
+  shipping_cost?: number;
+  discount_amount?: number;
+  notes?: string;
+  procurement_plan_id?: string;
+  items: PurchaseOrderItemCreate[];
+}
+
+/**
+ * Create a new purchase order
+ */
+export async function createPurchaseOrder(
+  tenantId: string,
+  data: PurchaseOrderCreateData
+): Promise<PurchaseOrderDetail> {
+  return apiClient.post<PurchaseOrderDetail>(
+    `/tenants/${tenantId}/procurement/purchase-orders`,
+    data
+  );
+}
+
 /**
  * Get list of purchase orders with optional filters
  */

frontend/src/api/services/suppliers.ts

@@ -24,11 +24,6 @@ import type {
   SupplierStatistics,
   SupplierDeletionSummary,
   SupplierResponse as SupplierResponse_,
-  PurchaseOrderCreate,
-  PurchaseOrderUpdate,
-  PurchaseOrderResponse,
-  PurchaseOrderApproval,
-  PurchaseOrderSearchParams,
   DeliveryCreate,
   DeliveryUpdate,
   DeliveryResponse,