Pytest example creds

[jazad136]

📌 Summary

Ensures that playwright tests and (maybe additionally unit tests) run with the right login credentials.

🔁 Reproduction Steps

#255 [CHORE]: Implement comprehensive Playwright test automation for the entire MCP Gateway Admin UI with Makefile targets and GitHub Actions

🐞 Root Cause

Playwright tests would not run because login credentials were not being pulled from settings.py

💡 Fix Description

Added reference to settings.py credentials to admin_page fixture in conftest.py

🧪 Verification

Check	Command	Status
Lint suite	make lint	passed
Unit tests	make test	2 / 4000 failed (other mcp-gateway unit test 401 unauthorized
		may need fixing using second ticket
Coverage ≥ 90 %	make coverage	2196 failed
Manual regression no longer fails	steps / screenshots	1657 passed, 183 skipped
		2114 warnings, 102 errors