docs: fix DEVELOPER_SETUP.md outdated references and tooling

[ismaeldouglasdev]

The DEVELOPER_SETUP.md has outdated references:

1. Lines 30, 49: References wrong fork URL (imadahmad9507-ops instead of Agentscreator)
2. Lines 175-178: Mentions black and flake8 but the project uses ruff

Let me fix:

[github-actions]

Possible duplicate issue detected — this issue may already be tracked:

• docs: fix DEVELOPER_SETUP.md outdated references and tooling #296 (100% similar): docs: fix DEVELOPER_SETUP.md outdated references and tooling
• docs: fix DEVELOPER_SETUP.md outdated references and tooling #298 (100% similar): docs: fix DEVELOPER_SETUP.md outdated references and tooling
• docs: fix DEVELOPER_SETUP.md outdated references and tooling #299 (99% similar): docs: fix DEVELOPER_SETUP.md outdated references and tooling

If this is a duplicate, please close this issue and continue the discussion there. If it's not a duplicate, feel free to ignore this comment.