Suppress FastAPI example/examples deprecation warnings

The warnings are cosmetic - we use 'example' instead of 'examples' because it works better for pre-filling Swagger UI input fields with default values.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

pyproject.toml

@@ -42,3 +42,9 @@ package = true
 dev = [
     "pytest>=8.3.5",
 ]
+
+[tool.pytest.ini_options]
+filterwarnings = [
+    "ignore::DeprecationWarning:pydantic.*",
+    "ignore:.*example.* has been deprecated.*:DeprecationWarning",
+]