[lucaseduoli]

This pull request introduces support for setting a custom path prefix for Langflow using the LANGFLOW_ROOT_PATH environment variable, which is useful when serving Langflow behind a reverse proxy. It updates the Docker and Compose configurations, adds documentation, and provides a robust entrypoint script to patch frontend assets at container startup.

Langflow path prefix support:

• Added LANGFLOW_ROOT_PATH environment variable support to allow specifying a path prefix (e.g., /langflow) for Langflow, making reverse proxy setups easier. This is documented in .env.example and docs/reference/configuration.mdx. [1] [2]
• Updated docker-compose.yml to pass LANGFLOW_ROOT_PATH from the environment to the Langflow service.

Entrypoint and asset patching:

• Introduced a new entrypoint script scripts/langflow-entrypoint.py that normalizes the root path, locates packaged frontend assets, and patches them to use the specified path prefix, ensuring Langflow works correctly with the configured base path.
• Updated Dockerfile.langflow.dev to copy the new entrypoint script and set it as the container's entrypoint, so the patching logic runs automatically at startup.

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