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/models/receipt.py

@@ -29,6 +29,13 @@ class ReceiptStatus(str, Enum):
     SYNCED = "synced"                  # Synced to Oracle (Phase 2)
 
 
+class PaymentMode(str, Enum):
+    """Payment mode - how the expense was paid."""
+    CASA = "casa"                        # Numerar firma (5311)
+    BANCA = "banca"                      # Virament/POS (5121)
+    AVANS_DECONTARE = "avans_decontare"  # Decont angajat (542)
+
+
 if TYPE_CHECKING:
     from .accounting_entry import AccountingEntry
 
@@ -62,11 +69,15 @@ class Receipt(SQLModel, table=True):
 
     # Oracle references (nomenclatures)
     company_id: int
-    partner_id: Optional[int] = Field(default=None)
-    partner_name: Optional[str] = Field(default=None, max_length=200)  # Cache for display
+    # partner_id removed - supplier data is text-only (partner_name, cui)
+    partner_name: Optional[str] = Field(default=None, max_length=200)  # Supplier name from OCR/selection
+    cui: Optional[str] = Field(default=None, max_length=20)  # Fiscal code from OCR
+    ocr_raw_text: Optional[str] = Field(default=None)  # Raw OCR text for debugging
+    payment_methods: Optional[str] = Field(default=None, max_length=500)  # JSON: [{"method":"CARD","amount":"50.00"}]
     cash_register_id: Optional[int] = Field(default=None)  # Cash/Bank ID from Oracle
     cash_register_name: Optional[str] = Field(default=None, max_length=100)  # Cache for display
     cash_register_account: Optional[str] = Field(default=None, max_length=20)  # Account code (5311, 5121)
+    payment_mode: Optional[str] = Field(default=None, max_length=20)  # PaymentMode value: casa/banca/avans_decontare
 
     # Workflow
     status: ReceiptStatus = Field(default=ReceiptStatus.DRAFT)