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/migrations/versions/20251215_add_ocr_fields_to_receipt.py

@@ -0,0 +1,35 @@
+"""add_ocr_fields_to_receipt
+
+Revision ID: 4b8e5f2a1d93
+Revises: 3a653da79002
+Create Date: 2025-12-15 10:00:00.000000+00:00
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+
+
+# revision identifiers, used by Alembic.
+revision: str = '4b8e5f2a1d93'
+down_revision: Union[str, None] = '3a653da79002'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Add OCR-related columns to receipts table
+    with op.batch_alter_table('receipts', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('cui', sqlmodel.sql.sqltypes.AutoString(length=20), nullable=True))
+        batch_op.add_column(sa.Column('ocr_raw_text', sa.Text(), nullable=True))
+        batch_op.add_column(sa.Column('payment_methods', sqlmodel.sql.sqltypes.AutoString(length=500), nullable=True))
+
+
+def downgrade() -> None:
+    # Remove OCR-related columns from receipts table
+    with op.batch_alter_table('receipts', schema=None) as batch_op:
+        batch_op.drop_column('payment_methods')
+        batch_op.drop_column('ocr_raw_text')
+        batch_op.drop_column('cui')

data-entry-app/backend/migrations/versions/20251215_remove_partner_id.py

@@ -0,0 +1,29 @@
+"""Remove partner_id from receipts - supplier data is text-only
+
+Revision ID: 20251215_remove_partner_id
+Revises: 20251216_payment_mode
+Create Date: 2025-12-15
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '20251215_remove_partner_id'
+down_revision: Union[str, None] = '20251216_payment_mode'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Remove partner_id column - supplier data is now text-only (partner_name, cui)."""
+    # Drop the partner_id column
+    op.drop_column('receipts', 'partner_id')
+
+
+def downgrade() -> None:
+    """Re-add partner_id column."""
+    op.add_column('receipts', sa.Column('partner_id', sa.Integer(), nullable=True))

data-entry-app/backend/migrations/versions/20251216_add_payment_mode.py

@@ -0,0 +1,44 @@
+"""Add payment_mode field to receipts table.
+
+Revision ID: 20251216_payment_mode
+Revises: 4b8e5f2a1d93
+Create Date: 2024-12-16
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '20251216_payment_mode'
+down_revision = '4b8e5f2a1d93'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Add payment_mode column and migrate existing data."""
+    with op.batch_alter_table('receipts', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('payment_mode', sa.String(length=20), nullable=True))
+
+    # Migrate existing data based on cash_register_account
+    op.execute("""
+        UPDATE receipts
+        SET payment_mode = 'casa'
+        WHERE cash_register_account LIKE '531%' AND payment_mode IS NULL
+    """)
+    op.execute("""
+        UPDATE receipts
+        SET payment_mode = 'banca'
+        WHERE cash_register_account LIKE '512%' AND payment_mode IS NULL
+    """)
+    op.execute("""
+        UPDATE receipts
+        SET payment_mode = 'avans_decontare'
+        WHERE cash_register_account LIKE '542%' AND payment_mode IS NULL
+    """)
+
+
+def downgrade() -> None:
+    """Remove payment_mode column."""
+    with op.batch_alter_table('receipts', schema=None) as batch_op:
+        batch_op.drop_column('payment_mode')