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/schemas/ocr.py

@@ -14,6 +14,12 @@ class TvaEntry(BaseModel):
     amount: Decimal = Field(description="TVA amount for this rate")
 
 
+class PaymentMethod(BaseModel):
+    """Payment method entry from OCR."""
+    method: str = Field(description="CARD or NUMERAR")
+    amount: Decimal = Field(description="Amount paid")
+
+
 class ExtractionData(BaseModel):
     """Extracted receipt data from OCR."""
 
@@ -32,6 +38,10 @@ class ExtractionData(BaseModel):
     address: Optional[str] = Field(default=None, description="Vendor address")
     items_count: Optional[int] = Field(default=None, description="Number of items/articles")
 
+    # Payment methods extracted from receipt
+    payment_methods: List[PaymentMethod] = Field(default=[], description="Payment methods from receipt (CARD, NUMERAR)")
+    suggested_payment_mode: Optional[str] = Field(default=None, description="Auto-suggested payment mode based on OCR (casa/banca)")
+
     confidence_amount: float = Field(default=0.0, ge=0, le=1, description="Amount extraction confidence")
     confidence_date: float = Field(default=0.0, ge=0, le=1, description="Date extraction confidence")
     confidence_vendor: float = Field(default=0.0, ge=0, le=1, description="Vendor extraction confidence")