Add implicit HEAD and automatic OPTIONS responses to FastAPI routes

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What this task asks for

Add configurable implicit HEAD handling and automatic OPTIONS responses for FastAPI routes, routers, and included routers. Add `auto_head` and `auto_options` to FastAPI/APIRouter constructors, decorators, `api_route`, `add_api_route`, and `include_router`. `auto_head` defaults on for GET routes. `auto_options` defaults off. Implicit OPTIONS returns 200 JSON with `path`, ordered `methods`, and `operations`, where `operations` matches OpenAPI for that path excluding HEAD and OPTIONS, and sends `Allow`. Public signatures exposing the new parameters must use FastAPIs `Annotated[..., Doc(...)]` style. Instance methods `get_stats()` and `reset_stats()` return a deep copy shaped `{full_path: {"head_hits": int, "options_hits": int}}`, clear counts, track implicit hits only, and ignore non-HTTP scopes.