fix(agent): install main module and gradio for CLI and Web UI

[YurunChen]

Description

Fixes two packaging issues in clawgui-agent/setup.py that break the default README install path (uv pip install -e .):

1. phone-agent CLI fails with ModuleNotFoundError: No module named 'main' because main.py was not installed as a module while the console entry point references main:main.
2. python webui.py fails with ModuleNotFoundError: No module named 'gradio' because gradio is listed in requirements.txt but not in setup.py install_requires, and the README install steps only run pip install -e ..

Changes:

• Add py_modules=["main"] so the phone-agent console script works after install.
• Add gradio>=4.0.0 to install_requires so Web UI works without a separate requirements.txt install step.
• Update the package URL to point at the ClawGUI repository.

Fixes #

Type of Change

• Bug fix
• New feature
• New model support (ClawGUI-Eval)
• New environment support (ClawGUI-RL)
• Documentation update
• Refactor / code quality
• Other:

Module(s) Affected

• clawgui-agent
• clawgui-eval
• clawgui-rl
• Root / docs

Checklist

• I have read the Contributing Guide
• My code follows the existing style of the module I'm modifying
• I have tested my changes locally
• I have updated documentation / README where relevant
• For ClawGUI-Eval: I have added the model to the supported model table and provided reproduction results (or noted they are pending)
• For ClawGUI-RL: I have verified training runs to completion without error on at least one environment

Testing

Verified in a clean virtual environment using only the README install path:

cd clawgui-agent
uv venv .venv --python 3.12
source .venv/bin/activate
uv pip install -e .
phone-agent --help      # previously: ModuleNotFoundError: No module named 'main'
python webui.py --help  # previously: ModuleNotFoundError: No module named 'gradio'
python main.py --help   # still works

Also confirmed the bugs reproduce on the current upstream commit (d990d3e) before this patch.

Additional Notes

• python main.py remains the documented primary CLI path in README; this patch makes the registered phone-agent console script work as intended.
• No new top-level dependencies beyond what requirements.txt already declared for Web UI usage.