Add support for fastapi's lazy routers (#379)

Support FastAPI 0.137.1+ included-router trees, including routes added
after inclusion, for both versioned and unversioned Cadwyn routing

Bump version to 6.2.2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Bump version to 6.2.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add custom static asset URL support for Swagger UI and ReDoc (#361)

Allow overriding CDN URLs for docs JS, CSS, and favicon assets
via swagger_js_url, swagger_css_url, swagger_favicon_url,
redoc_js_url, and redoc_favicon_url parameters on Cadwyn.

Closes #361

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Fix compatibility with Starlette 1.0.0 and upgrade dependencies

Starlette 1.0.0 removed the deprecated TemplateResponse(name, context)
calling convention. Switch to kwargs-based call that works on both old
and new Starlette. Also remove test for JSON body without Content-Type
which is no longer supported by FastAPI 0.132.0+.

Bump version to 6.1.1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Fix up changelog versioning

improve documentation-16 (#355)

Bump version to 6.0.3 and update changelog for FastAPI compatibility

Bump version to 6.0.2 and update changelog for recent fixes