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 from /sources to /hooks and /hooks/new; the event log from .../logs to /hook/ID/events; entrypoint URLs, the ones senders post to, from /webhook/UUID to /h/UUID. The old paths are simply gone, per the owner's ruling. Every link, redirect, form action, test, comment and README mention follows; every link to the event log, and its title and heading, read "Full Event Log".

Keeping the UUID out of logs, metrics labels and error reports, and the receiver rate limits, key on the route itself, so they cover /h/ unchanged. Routed tests follow every link and form the pages render to a moved page.

Model: opus-5-5

internal/handlers/logbound_test.go

@@ -4,7 +4,7 @@ package handlers_test
 // this package reach a value an UNAUTHENTICATED client picks outright
 // and of a length it picks outright:
 //
-//   - the unknown-entrypoint DEBUG line on /webhook/{uuid}, whose
+//   - the unknown-entrypoint DEBUG line on /h/{uuid}, whose
 //     path segment matched no stored entrypoint and so is bounded by
 //     nothing;
 //   - the failed-login DEBUG lines, whose username is a form field.
@@ -190,12 +190,12 @@ func assertNoClientText(t *testing.T, buf *bytes.Buffer) {
 // route pattern.
 func receiverRouter(h *handlers.Handlers) *chi.Mux {
 	router := chi.NewRouter()
-	router.Post("/webhook/{uuid}", h.HandleWebhook())
+	router.Post("/h/{uuid}", h.HandleWebhook())
 
 	return router
 }
 
-// postReceiver sends one POST at /webhook/<segment>.
+// postReceiver sends one POST at /h/<segment>.
 //
 // RawPath is cleared after parsing so chi routes on the decoded path
 // and the handler sees the raw bytes rather than their percent-escaped
@@ -210,7 +210,7 @@ func postReceiver(
 	req := httptest.NewRequestWithContext(
 		context.Background(),
 		http.MethodPost,
-		"/webhook/"+url.PathEscape(segment),
+		"/h/"+url.PathEscape(segment),
 		strings.NewReader(""),
 	)
 	req.URL.RawPath = ""
@@ -507,7 +507,7 @@ func TestVerificationCapacity_LogLineDoesNotTrackPathSize(
 					http.StatusServiceUnavailable,
 					postLoginAtPath(
 						t, h,
-						"/source/"+url.PathEscape(
+						"/hook/"+url.PathEscape(
 							oversizedFill(fill),
 						)+"/login",
 					),