docs(events): reorganize presentation and launcher documentation

Split the monolithic MODULE__AE_Events_PressMgmt_Launcher.md into focused,
granular modules to improve maintainability and onsite utility.

- Created MODULE__AE_Events_Presentation_Management.md (Back-office focus)
- Created MODULE__AE_Events_Launcher.md (Podium display focus)
- Created GUIDE__AE_Events_Onsite_Runbook.md (SRR and onsite workflows)
- Promoted PROJECT__AE_Events_Launcher_Native_integration.md to
  MODULE__AE_Events_Launcher_Native.md (Permanent technical reference)
- Renamed 'Press Mgmt' references to 'Presentation Management' for clarity.
- Removed redundant README.md in launcher route.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/events/[event_id]/(launcher)/README.md

@@ -1,9 +0,0 @@
-# Aether (AE) Event Launcher Module (v3)
-
-This directory contains the files for the new Event Launcher module (v3). Detailed documentation to follow.
-
-This should be able to run in 3 modes:
-
-- Default - What most users will see for demo purposes
-- Onsite - This is what is set onsite, usually just in the Speaker Ready Room
-- Native App - This is for the native app version of Aether and used on the MacBook laptops in each of the session rooms