feat: edit API keys (name, rights); quick dump text above its buttons; inline note badges

- PATCH /keys/{id} renames a key or changes its scopes; the secret stays. Settings → API gets an
  edit button per key with the same switches as for a new key.
- Quick dump: a multiline text gets the full width, the buttons move to their own row below; the
  bar only goes back to one line once the text is clearly shorter (no flip-flopping).
- Notes: the "Erweitert"/"Unteraufgabe" badges sit right after the checkbox text.

v0.38.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/server.go

@@ -304,6 +304,7 @@ func (s *Server) Router() http.Handler {
 		// API Keys Management
 		r.Get("/api/v1/keys", s.handleGetAPIKeys)
 		r.Post("/api/v1/keys", s.handleCreateAPIKey)
+		r.Patch("/api/v1/keys/{id}", s.handleUpdateAPIKey)
 		r.Delete("/api/v1/keys/{id}", s.handleDeleteAPIKey)
 
 		// Staff Routes (Server-Admin)