feat(core): a service a handler asks for, and a body typed in its signature
Two things every handler was writing by hand. @Inject on a field is filled inside bind, before onInit, once per handler at boot: the request path still reads a field. The service is looked up by the field's exact declared type; a static or final field is refused, and a type nothing provides fails the boot naming the field. onInit stays for what has to be computed, or for a service that may not be there. BodyHandler<B> puts the body type in the signature — handle(req, res, body) — and leaves reading it to the format. bodyTypeOf resolves that type argument through a whole chain of bases, so tooling can read off a class what a route takes. @Consumes says in which media type, inherited from the base class that implements the reading, and is descriptive: the router does not enforce it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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