Add badges to README

[stedrew]

Summary

• Add CI status badges for all three GitHub Actions workflows (Controller Tests, Router Tests, E2E Tests)
• Add License (Apache 2.0), Python 3.10, Django 4.2, and Docker badges
• Badges are placed between the title and the logo image

Closes #22

Test plan

• Verify all CI badges render and link to the correct workflow run pages on GitHub
• Verify License badge links to the LICENSE file
• Verify Python, Django, and Docker badges display correctly

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