fix(#150): auto-register HEAD route for GET routes

[weilixiong]

Fix #150\nAuto-register HEAD route when GET route is registered.\n\n## Fix #151\nSuppress response body in send() when request method is HEAD (RFC 9110 §9.3.2).

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[weilixiong]

Hi, this PR addresses #150 (auto-register HEAD for GET routes) and #151 (suppress body for HEAD). The HEAD body fix follows RFC 9110 §9.3.2 — empty body sent when method is HEAD. Would appreciate a review.

[VikramAditya33]

Please reduce down the scope of PR to #151 only. Thank you