feat: Add payment methods extraction, OCR improvements, and AutoComplete fix

Backend:
- Add payment_methods and payment_mode fields to Receipt model
- Add payment method extraction (CARD/NUMERAR) with auto-suggestion logic
- Improve OCR service with TVA validation and reverse calculation
- Fix nomenclature service supplier limit (was 50, now unlimited)
- Add OCR fields migrations (ocr_raw_text, ocr_confidence, payment_mode)

Frontend:
- Fix AutoComplete to properly display supplier name after OCR
- Add payment methods display in OCR preview with suggested payment mode
- Improve ReceiptCreateView form handling and OCR data application

Database migrations:
- 20251215_add_ocr_fields_to_receipt.py
- 20251215_remove_partner_id.py
- 20251216_add_payment_mode.py

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

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

data-entry-app/backend/app/db/crud/receipt.py

@@ -37,6 +37,30 @@ def _serialize_tva_breakdown(tva_breakdown: Optional[List[Any]]) -> Optional[str
     return json.dumps(serializable)
 
 
+def _serialize_payment_methods(payment_methods: Optional[List[Any]]) -> Optional[str]:
+    """Serialize payment methods list to JSON string for SQLite storage."""
+    if payment_methods is None:
+        return None
+
+    serializable = []
+    for pm in payment_methods:
+        if hasattr(pm, 'model_dump'):
+            item = pm.model_dump()
+        elif isinstance(pm, dict):
+            item = pm.copy()
+        else:
+            item = dict(pm)
+
+        # Convert Decimal to float for JSON
+        if 'amount' in item:
+            if hasattr(item['amount'], '__float__'):
+                item['amount'] = float(item['amount'])
+
+        serializable.append(item)
+
+    return json.dumps(serializable)
+
+
 class ReceiptCRUD:
     """CRUD operations for Receipt model."""
 
@@ -47,9 +71,10 @@ class ReceiptCRUD:
         created_by: str,
     ) -> Receipt:
         """Create a new receipt."""
-        # Get data as dict and serialize tva_breakdown to JSON string
+        # Get data as dict and serialize tva_breakdown and payment_methods to JSON string
         receipt_data = data.model_dump()
         receipt_data['tva_breakdown'] = _serialize_tva_breakdown(receipt_data.get('tva_breakdown'))
+        receipt_data['payment_methods'] = _serialize_payment_methods(receipt_data.get('payment_methods'))
 
         receipt = Receipt(
             **receipt_data,
@@ -165,9 +190,11 @@ class ReceiptCRUD:
         """Update receipt fields."""
         update_data = data.model_dump(exclude_unset=True)
 
-        # Serialize tva_breakdown to JSON string if present
+        # Serialize tva_breakdown and payment_methods to JSON string if present
         if 'tva_breakdown' in update_data:
             update_data['tva_breakdown'] = _serialize_tva_breakdown(update_data['tva_breakdown'])
+        if 'payment_methods' in update_data:
+            update_data['payment_methods'] = _serialize_payment_methods(update_data['payment_methods'])
 
         for field, value in update_data.items():
             setattr(receipt, field, value)