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/eu/purchase_orders.json

@@ -3,13 +3,57 @@
   "purchase_orders": "Erosketa Aginduak",
   "created": "Sortua",
   "supplier": "Hornitzailea",
+  "supplier_name": "Hornitzailearen Izena",
   "order_date": "Eskabidearen Data",
   "expected_delivery": "Espero den Entrega",
   "items": "Produktuak",
   "no_items": "Ez dago produkturik eskaera honetan",
   "notes": "Oharrak",
+  "order_notes": "Eskaeraren Oharrak",
   "not_found": "Erosketa agindua ez da aurkitu",
   "total_amount": "Guztira",
+  "general_information": "Informazio Orokorra",
+  "financial_summary": "Finantza Laburpena",
+  "dates": "Datak",
+  "po_number": "Agindu Zenbakia",
+  "status_label": "Egoera",
+  "quantity": "Kopurua",
+  "unit_price": "Unitate Prezioa",
+  "quality_requirements": "Kalitate Baldintzak",
+  "total": "Guztira",
+  "priority": "Lehentasuna",
+  "required_delivery_date": "Beharrezko Entrega Data",
+  "supplier_info": "Hornitzailearen Informazioa",
+  "order_details": "Eskaeraren Xehetasunak",
+  "products": "Produktuak",
+  "modify_order": "Erosketa Agindua Aldatu",
+  "modifying_order": "Agindua Aldatzen",
+  "supplier_cannot_modify": "Hornitzailea ezin da aldatu",
+  "adjust_priority": "Doitu eskaera honen lehentasuna",
+  "delivery_deadline": "Entregaren muga data",
+  "special_instructions": "Hornitzailearentzako jarraibide bereziak...",
+  "additional_info": "Informazio gehigarria edo jarraibide bereziak",
+  "product": "Produktua",
+  "sku": "SKU",
+  "ordered_quantity": "Eskatutako Kopurua",
+  "unit": "Unitatea",
+  "unit_price_euro": "Unitate Prezioa (€)",
+  "add_product": "Produktua Gehitu",
+  "modify_quantities": "Aldatu kopuruak, unitateak eta prezioak behar den bezala",
+  "at_least_one_product": "Mesedez, gehitu gutxienez produktu bat",
+  "quantities_greater_zero": "Kopuru guztiak 0 baino handiagoak izan behar dira",
+  "products_need_names": "Produktu guztiek izena izan behar dute",
+  "priority_urgent": "Premiazkoa",
+  "priority_high": "Altua",
+  "priority_normal": "Normala",
+  "priority_low": "Baxua",
+  "unit_kg": "Kilogramoak",
+  "unit_g": "Gramoak",
+  "unit_l": "Litroak",
+  "unit_ml": "Mililitroak",
+  "unit_units": "Unitateak",
+  "unit_boxes": "Kutxak",
+  "unit_bags": "Poltsak",
   "status": {
     "draft": "Zirriborroa",
     "pending_approval": "Onarpenaren Zain",
@@ -31,6 +75,8 @@
   "actions": {
     "approve": "Agindua Onartu",
     "modify": "Agindua Aldatu",
-    "close": "Itxi"
+    "close": "Itxi",
+    "save": "Aldaketak Gorde",
+    "cancel": "Ezeztatu"
   }
 }