Replaces FastMCP.as_proxy() helper calls with create_proxy(), rewrites the
mount() as_proxy=/prefix= kwarg tests to plain mount() (the params are gone),
and deletes deprecation-only tests for as_proxy() and remove_tool().
* Move OpenAPI to providers/openapi/ submodule
Migrates the OpenAPI implementation to the provider pattern:
- Creates src/fastmcp/server/providers/openapi/ submodule with provider.py,
components.py, and routing.py
- Converts server/openapi/ to deprecated re-export stubs
- FastMCPOpenAPI remains as deprecated wrapper that uses OpenAPIProvider
- Updates experimental/server/openapi to import from new canonical location
* Update tests and FastMCP methods to use OpenAPIProvider
- Update FastMCP.from_openapi() and from_fastapi() to use OpenAPIProvider
directly, returning FastMCP instead of deprecated FastMCPOpenAPI
- Move tests from tests/server/openapi/ to tests/server/providers/openapi/
- Update all test imports to use new canonical location
- Add tests/deprecated/openapi/ for backward compatibility testing
- Update tests/client/test_openapi.py to use new imports
* Fix deprecation warning tests and address CodeRabbit feedback
- Use importlib.reload() to ensure deprecation warnings fire in tests
- Change logger.error to logger.exception for better stack traces
* Replace type: ignore[attr-defined] with isinstance assertions in tests
* Fix isinstance assertions in failing tests
- Fix enum test to check for ResponseEnum instead of str
- Fix binary resource test to check for BlobResourceContents instead of TextResourceContents
- Fix Root type tests to check attributes directly instead of isinstance checks
* Fix type errors without using type: ignore
- Remove execution methods from TransformingProvider (only handles transformations)
- Add execution methods to base Provider class with default implementations
- Fix type narrowing in tests using cast() instead of type: ignore
- Fix PromptResult type handling in prompt render tests
- Fix type narrowing in middleware test for arguments and structured_content
