feat(data-entry): Add unified receipt form with OCR confidence tracking

New unified receipt creation system with:
- UnifiedReceiptForm component with inline OCR preview and confidence indicators
- Compact upload zone with drag-drop and camera support
- TVA and Payment fields with dynamic add/remove
- Supplier dual-field with autocomplete and OCR hint
- Receipt form sections with collapsible auxiliary data

Backend OCR improvements:
- Add confidence_tva and confidence_payment to extraction results
- Update TVA extraction to return confidence scores
- Include TVA (15%) and payment (10%) in overall_confidence calculation

Also includes:
- CSS design system rules documentation
- Port check helper function for service scripts
- Expanded design tokens documentation in CLAUDE.md

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

src/router/index.js

@@ -70,19 +70,25 @@ const routes = [
       {
         path: 'create',
         name: 'ReceiptCreate',
-        component: () => import('@data-entry/views/receipts/ReceiptCreateView.vue'),
+        component: () => import('@data-entry/views/receipts/ReceiptCreateUnifiedView.vue'),
         meta: { requiresAuth: true, title: 'Bon Nou - ROA2WEB' }
       },
+      {
+        path: 'create-old',
+        name: 'ReceiptCreateOld',
+        component: () => import('@data-entry/views/receipts/ReceiptCreateView.vue'),
+        meta: { requiresAuth: true, title: 'Bon Nou (Legacy) - ROA2WEB' }
+      },
       {
         path: ':id',
         name: 'ReceiptDetail',
-        component: () => import('@data-entry/views/receipts/ReceiptCreateView.vue'),
+        component: () => import('@data-entry/views/receipts/ReceiptCreateUnifiedView.vue'),
         meta: { requiresAuth: true, title: 'Detalii Bon - ROA2WEB' }
       },
       {
         path: ':id/edit',
         name: 'ReceiptEdit',
-        component: () => import('@data-entry/views/receipts/ReceiptCreateView.vue'),
+        component: () => import('@data-entry/views/receipts/ReceiptCreateUnifiedView.vue'),
         meta: { requiresAuth: true, title: 'Editare Bon - ROA2WEB' }
       },
       {