Refactor: Move backend files to backend/ directory and split .gitignore

backend/alembic/versions/63886baa1255_add_summary_to_conversation.py

@@ -0,0 +1,32 @@
+"""Add summary to conversation
+
+Revision ID: 63886baa1255
+Revises: a15fde9a62df
+Create Date: 2026-02-07 22:34:47.254569
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '63886baa1255'
+down_revision: Union[str, Sequence[str], None] = 'a15fde9a62df'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('conversations', sa.Column('summary', sa.Text(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('conversations', 'summary')
+    # ### end Alembic commands ###