fix: Replace deprecated @app.route with app.add_route for Starlette 1.0 compatibility

[raynercodes]

Fixes #271

Problem

Starlette 1.0 removed the @app.route() decorator. Tests and documentation examples using this pattern throw:
AttributeError: 'Starlette' object has no attribute 'route'

Changes

• Updated tests/test_starlette_extension.py to use app.add_route() instead of @app.route() decorator
• Updated docs/examples.md to reflect the new routing pattern

Testing

Before this fix: 12 tests failing with AttributeError
After this fix: 6 tests failing (pre-existing timestamp precision issue unrelated to this PR)

All previously passing tests continue to pass still.

[raynercodes]

Thanks for the review — applied the suggestion.

[dotlambda]

You overlooked the other spots where you made the same mistake.

[raynercodes]

I Fixed all remaining instances. I updated handler to the correct function names throughout your examples.md.

[antoine-crossbeam]

Hey @raynercodes any news on this one ? :)

[raynercodes]

Hey @raynercodes any news on this one ? :)

Sorry for the late response I kept forgetting to message you back but I actually haven't heard back from the author he never did merge the PR