feat: codegen routes — sanitize resource names, --inject-request/--package, expand form bodies

codegen_routes.generate_routes now sanitizes resource identifiers (fetch-requests -> fetch_requests), optionally prepends 'request: Request' (inject_request) and emits <resource>/routes.py packages with __init__.py (package). multipart/form-data and x-www-form-urlencoded bodies expand to per-property UploadFile/File/Form params instead of an opaque dict; spec paths are normalized to forward slashes to avoid Windows escape issues. Adds CLI flags --inject-request/--package, 7 focused tests, and refreshes lib/wiki/MCP docs to the real CLI.

openapi_first/codegen_routes.pyi

@@ -6,4 +6,6 @@ def generate_routes(
     *,
     use_models: bool = ...,
     models_module: str = ...,
+    inject_request: bool = ...,
+    package: bool = ...,
 ) -> list[Path]: ...