Update .dockerignore, alembic revision, and entrypoint script for consistency and reliability

- Expanded `.dockerignore` to exclude Python and packaging-related artifacts for cleaner Docker builds.
- Updated Alembic `down_revision` in migration script to reflect correct dependency chain.
- Modified entrypoint script to use `uv` with `--no-project` flag, preventing permission issues in bind-mounted volumes.

backend/entrypoint.sh

@@ -3,10 +3,13 @@ set -e
 echo "Starting Backend"
 
 # Apply database migrations
-uv run alembic upgrade head
+# Avoid installing the project in editable mode (which tries to write egg-info)
+# when running inside a bind-mounted volume with restricted permissions.
+# See: https://github.com/astral-sh/uv (use --no-project to skip project build)
+uv run --no-project alembic upgrade head
 
 # Initialize database (creates first superuser if needed)
-uv run python app/init_db.py
+uv run --no-project python app/init_db.py
 
 # Execute the command passed to docker run
 exec "$@"