Use system actor for cycle generation

Update cycle generator, member hooks, and job to use system actor.
Remove actor parameters as cycle generation is a mandatory side effect.

lib/mv_web/live/member_live/show/membership_fees_component.ex

@@ -556,9 +556,8 @@ defmodule MvWeb.MemberLive.Show.MembershipFeesComponent do
   def handle_event("regenerate_cycles", _params, socket) do
     socket = assign(socket, :regenerating, true)
     member = socket.assigns.member
-    actor = current_actor(socket)
 
-    case CycleGenerator.generate_cycles_for_member(member.id, actor: actor) do
+    case CycleGenerator.generate_cycles_for_member(member.id) do
       {:ok, _new_cycles, _notifications} ->
         # Reload member with cycles
         actor = current_actor(socket)