build(test-django-debug-toolbar): Migrate to uv and pyproject.toml

[ericapisani]

Summary

• Replace pip/requirements.txt with uv/pyproject.toml for dependency management
• Update run.sh to use uv run instead of manual venv creation and pip install
• Remove legacy requirements.txt

Refs PY-2443

Test plan

• Verify pyproject.toml includes all dependencies from the original requirements.txt
• Verify run.sh uses uv run
• Verify requirements.txt is removed

🤖 Generated with Claude Code

[linear-code]

PY-2443

[sentry]

Bug: The run.sh script calls ./manage.py from the wrong directory. It needs to change into the mysite subdirectory before executing the command.
_{Severity: HIGH}

Suggested Fix

Update the script to change the current directory to mysite before running the manage.py command. A similar project uses cd mysite && uv run python ./manage.py runserver 0.0.0.0:8000 && cd .. which would resolve the issue.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: test-django-debug-toolbar/run.sh#L8

Potential issue: The `run.sh` script attempts to execute `uv run ./manage.py runserver
0.0.0.0:8000` from the `test-django-debug-toolbar/` directory. However, the `manage.py`
file is actually located within the `test-django-debug-toolbar/mysite/` subdirectory.
Because the path is incorrect, the script will fail at runtime with a 'No such file or
directory' error when it tries to find `manage.py`.

_{Did we get this right? 👍 / 👎 to inform future reviews.}