build: switch container dependency install from pip to uv

[seven320]

Motivation

• Replace pip with uv for dependency installation inside the Docker image to follow the requested change and keep container builds consistent.

Description

• Updated main/Dockerfile to install uv via curl -LsSf https://astral.sh/uv/install.sh | sh, add PATH for the uv binary, set UV_SYSTEM_PYTHON=1, copy main/requirements.txt to /tmp, and run uv pip install --no-cache -r /tmp/requirements.txt, and updated README.md to note that dependencies are installed by uv in Docker.

Testing

• Attempted docker compose build to validate the Dockerfile but the environment does not have Docker installed so the command failed with command not found: docker, and no other automated tests were executed.

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Codex Task