refactor(honeybar): HONEYBAR_ORIGIN statt INKNOTE_HONEYBAR_ORIGIN

Dieselben Namen wie in Aether. Die Leiste gehoert keiner App, sie ist ueberall
dieselbe Sache — dann soll sie auch ueberall gleich heissen. Ein zweiter Name
fuer dieselbe Einstellung ist eine Fehlerquelle beim Umziehen und beim Suchen.

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

readme.md

@@ -171,7 +171,7 @@ otherwise the app is reachable on the host's address without TLS.
 
 #### The HoneyOS bar
 
-`INKNOTE_HONEYBAR_ORIGIN` puts a strip along the top of every page that leads to
+`HONEYBAR_ORIGIN` puts a strip along the top of every page that leads to
 the other apps of the same system — it is served by HoneyOS, so what it looks
 like and which apps it lists are settled there, not here. Empty means no bar at
 all, and nothing about the app changes.
@@ -181,7 +181,7 @@ The value takes effect on restart: the page asks the server for it
 built into the image — an image is pulled ready-made, and a service worker keeps
 whole responses, so anything frozen into `index.html` would outlive the setting.
 
-`INKNOTE_HONEYBAR_KEY` is only needed when HoneyOS sits on a *different site*
+`HONEYBAR_KEY` is only needed when HoneyOS sits on a *different site*
 than InkNote (`honeyos.example.com` vs `notes.example.org`). The browser then
 withholds the HoneyOS session, and the bar has no other way to ask for the list
 of apps. Under a shared domain it can stay empty.