Fix ruff lint errors across codebase

- Auto-fix F401 (unused imports) and I001 (unsorted imports) with ruff --fix
- Manually fix E501 (line too long) in alembic migrations and src/ models
- Run ruff format to ensure consistent formatting

Co-Authored-By: Paperclip <noreply@paperclip.ing>

alembic/env.py

@@ -45,7 +45,11 @@ def run_migrations_online() -> None:
         poolclass=pool.NullPool,
     )
     with connectable.connect() as connection:
-        context.configure(connection=connection, target_metadata=target_metadata, version_table_column_width=128)
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            version_table_column_width=128,
+        )
         with context.begin_transaction():
             context.run_migrations()
         # Create any tables defined in models but not yet created by migrations.
@@ -56,6 +60,7 @@ def run_migrations_online() -> None:
             connection.commit()
         except Exception as exc:
             import logging
+
             logging.getLogger("alembic.env").warning(
                 "create_all failed (non-fatal, migrations should handle table creation): %s", exc
             )