Move webhook pages to /hook/ID and inbound URLs to /h/UUID (closes #367)

The webhook page and everything under it move from /source/ID to
/hook/ID, the list and new-webhook form to /hooks and /hooks/new, and
the event log from .../logs to /hook/ID/events, body download
included. Entrypoint URLs move from /webhook/UUID to /h/UUID, and the
webhook page shows only that form. The old paths are gone.

Links, redirects, form actions, tests, comments and the README follow.
Both links to the event log page, and its title and heading, now read
"Full Event Log". Go identifiers and template file names are
unchanged. Route tests reach every moved page and form through the
production router, taking each URL and token from the rendered page.

Model: opus-5-5

internal/server/sentry.go

@@ -55,7 +55,7 @@ func sentryClientOptions(dsn, release string) sentry.ClientOptions {
 //
 // URL is the third such field. NewRequest builds it as
 // scheme://host/path (interfaces.go:183), and on the receiver route
-// that path is /webhook/<uuid> in full — a write capability, not an
+// that path is /h/<uuid> in full — a write capability, not an
 // identifier. It is rebuilt here from the chi route pattern, on every
 // route, keeping the scheme and the host.
 //