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refactor(server): serve unencrypted HTTP/2 natively

Replaces the x/net h2c wrapper with the http.Server Protocols field.
The server now tracks HTTP/2 connections itself, so Shutdown drains
them like HTTP/1.1 ones and the GOAWAY workaround is no longer needed.
Cleartext HTTP/2 is negotiated by prior knowledge only.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>