feat: add clients nomenclator, order edit/delete/devalidate, invoice types, dashboard redesign

- New clients table with PF/PJ support, fiscal data (CUI, IBAN, eFactura fields)
- Full CRUD API for clients with search, sync integration
- Order lifecycle: edit header (DRAFT), devalidate (VALIDAT→DRAFT), delete order/invoice
- Invoice types: FACTURA (B2B) vs BON_FISCAL (B2C) with different nr formats
- OrderCreateView redesigned as multi-step flow (client→vehicle→details)
- Autocomplete from catalog_norme/catalog_preturi in OrderLineForm
- Dashboard now combines stats + full orders table with filter tabs and search
- ClientPicker and VehiclePicker with inline creation capability
- Frontend schema aligned with backend (missing columns causing sync errors)
- Mobile responsive fixes for OrderDetailView buttons

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/alembic/versions/6d8b5bd44531_add_clients_table_and_client_id_columns.py

@@ -0,0 +1,73 @@
+"""add_clients_table_and_client_id_columns
+
+Revision ID: 6d8b5bd44531
+Revises: 7df0fb1c1e6f
+Create Date: 2026-03-14 10:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '6d8b5bd44531'
+down_revision: Union[str, None] = '7df0fb1c1e6f'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create clients table
+    op.create_table(
+        'clients',
+        sa.Column('id', sa.String(length=36), primary_key=True),
+        sa.Column('tenant_id', sa.String(length=36), nullable=False, index=True),
+        sa.Column('created_at', sa.Text(), nullable=True),
+        sa.Column('updated_at', sa.Text(), nullable=True),
+        sa.Column('tip_persoana', sa.String(length=2), nullable=True),
+        sa.Column('denumire', sa.String(length=200), nullable=True),
+        sa.Column('nume', sa.String(length=100), nullable=True),
+        sa.Column('prenume', sa.String(length=100), nullable=True),
+        sa.Column('cod_fiscal', sa.String(length=20), nullable=True),
+        sa.Column('reg_com', sa.String(length=30), nullable=True),
+        sa.Column('telefon', sa.String(length=20), nullable=True),
+        sa.Column('email', sa.String(length=200), nullable=True),
+        sa.Column('adresa', sa.Text(), nullable=True),
+        sa.Column('judet', sa.String(length=50), nullable=True),
+        sa.Column('oras', sa.String(length=100), nullable=True),
+        sa.Column('cod_postal', sa.String(length=10), nullable=True),
+        sa.Column('tara', sa.String(length=2), nullable=True),
+        sa.Column('cont_iban', sa.String(length=34), nullable=True),
+        sa.Column('banca', sa.String(length=100), nullable=True),
+        sa.Column('activ', sa.Integer(), server_default='1', nullable=False),
+        sa.Column('oracle_id', sa.Integer(), nullable=True),
+    )
+
+    # Add client_id to vehicles
+    with op.batch_alter_table('vehicles') as batch_op:
+        batch_op.add_column(sa.Column('client_id', sa.String(length=36), nullable=True))
+
+    # Add client_id to orders
+    with op.batch_alter_table('orders') as batch_op:
+        batch_op.add_column(sa.Column('client_id', sa.String(length=36), nullable=True))
+
+    # Add client_id and tip_document to invoices
+    with op.batch_alter_table('invoices') as batch_op:
+        batch_op.add_column(sa.Column('client_id', sa.String(length=36), nullable=True))
+        batch_op.add_column(sa.Column('tip_document', sa.String(length=20), server_default='FACTURA', nullable=True))
+
+
+def downgrade() -> None:
+    with op.batch_alter_table('invoices') as batch_op:
+        batch_op.drop_column('tip_document')
+        batch_op.drop_column('client_id')
+
+    with op.batch_alter_table('orders') as batch_op:
+        batch_op.drop_column('client_id')
+
+    with op.batch_alter_table('vehicles') as batch_op:
+        batch_op.drop_column('client_id')
+
+    op.drop_table('clients')