feat: add import error tracking and translation tabs

Import Error Tracking:
- Add MarketplaceImportError model to store detailed error information
- Store row number, identifier, error type, message, and row data for each error
- Add API endpoint GET /admin/marketplace-import-jobs/{job_id}/errors
- Add UI to view and browse import errors in job details modal
- Support pagination and error type filtering

Translation Tabs:
- Replace flat translation list with tabbed interface on product detail page
- Add language tabs with full language names
- Add copy-to-clipboard functionality for translation content
- Improved UX with better visual separation of translations

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

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

alembic/versions/91d02647efae_add_marketplace_import_errors_table.py

@@ -0,0 +1,44 @@
+"""add marketplace import errors table
+
+Revision ID: 91d02647efae
+Revises: 987b4ecfa503
+Create Date: 2025-12-13 13:13:46.969503
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = '91d02647efae'
+down_revision: Union[str, None] = '987b4ecfa503'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create marketplace_import_errors table to store detailed import error information
+    op.create_table('marketplace_import_errors',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('import_job_id', sa.Integer(), nullable=False),
+        sa.Column('row_number', sa.Integer(), nullable=False),
+        sa.Column('identifier', sa.String(), nullable=True),
+        sa.Column('error_type', sa.String(length=50), nullable=False),
+        sa.Column('error_message', sa.Text(), nullable=False),
+        sa.Column('row_data', sa.JSON(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.ForeignKeyConstraint(['import_job_id'], ['marketplace_import_jobs.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('idx_import_error_job_id', 'marketplace_import_errors', ['import_job_id'], unique=False)
+    op.create_index('idx_import_error_type', 'marketplace_import_errors', ['error_type'], unique=False)
+    op.create_index(op.f('ix_marketplace_import_errors_id'), 'marketplace_import_errors', ['id'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_marketplace_import_errors_id'), table_name='marketplace_import_errors')
+    op.drop_index('idx_import_error_type', table_name='marketplace_import_errors')
+    op.drop_index('idx_import_error_job_id', table_name='marketplace_import_errors')
+    op.drop_table('marketplace_import_errors')