feat: add clients nomenclator, order edit/delete/devalidate, invoice types, dashboard redesign

- New clients table with PF/PJ support, fiscal data (CUI, IBAN, eFactura fields)
- Full CRUD API for clients with search, sync integration
- Order lifecycle: edit header (DRAFT), devalidate (VALIDAT→DRAFT), delete order/invoice
- Invoice types: FACTURA (B2B) vs BON_FISCAL (B2C) with different nr formats
- OrderCreateView redesigned as multi-step flow (client→vehicle→details)
- Autocomplete from catalog_norme/catalog_preturi in OrderLineForm
- Dashboard now combines stats + full orders table with filter tabs and search
- ClientPicker and VehiclePicker with inline creation capability
- Frontend schema aligned with backend (missing columns causing sync errors)
- Mobile responsive fixes for OrderDetailView buttons

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/db/seed.py

@@ -52,14 +52,7 @@ ANSAMBLE = [
     "Revizie",
 ]
 
-TIPURI_DEVIZ = [
-    "Deviz reparatie",
-    "Deviz revizie",
-    "Deviz diagnosticare",
-    "Deviz estimativ",
-    "Deviz vulcanizare",
-    "Deviz ITP",
-]
+TIPURI_DEVIZ = ["Service", "ITP", "Regie", "Constatare"]
 
 TIPURI_MOTOARE = ["Benzina", "Diesel", "Hibrid", "Electric", "GPL"]