Attribute Macro controller 

#[controller]

Attribute macro for a controller’s impl block.

Reads the routes! { … } block inside the impl and generates the controller’s Controller implementation — its route table, parameter extraction, and dispatch. Attribute options: prepare = Self::method (a hook run before every handler in the controller), lax (relax strict parameter rejection), rate_limit = "class" (stamp a rate-limit class onto matched requests), max_body_bytes = N (per-controller request-body cap, in bytes), and expects = "floor" (declare the least-privileged caller this controller accepts — surfaced by Router::mounts() for route-family coverage checks).