Fix port number in README.md to match app.py configuration

[Copilot]

Documentation incorrectly stated server runs on port 8000, but app.py configures port 8080.

Changes

• Updated all port references in python/README.md from 8000 to 8080:
  • Server start URL
  • Swagger UI URL
  • Health check curl example

# Before
curl http://localhost:8000/health

# After
curl http://localhost:8080/health

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.