Delete events sx_components.py — move all rendering to sxc/pages

Phase 7 of the zero-Python-rendering plan. All 100 rendering functions
move from events/sx/sx_components.py into events/sxc/pages/__init__.py.
Route handlers (15 files) import from sxc.pages instead.
load_service_components call moves into _load_events_page_files.

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

events/bp/calendar/admin/routes.py

@@ -18,7 +18,7 @@ def register():
     @bp.get("/description/")
     @require_admin
     async def calendar_description_edit(calendar_slug: str, **kwargs):
-        from sx.sx_components import render_calendar_description_edit
+        from sxc.pages import render_calendar_description_edit
         html = await render_calendar_description_edit(g.calendar)
         return sx_response(html)
 
@@ -34,7 +34,7 @@ def register():
         g.calendar.description = description
         await g.s.flush()
 
-        from sx.sx_components import render_calendar_description
+        from sxc.pages import render_calendar_description
         html = await render_calendar_description(g.calendar, oob=True)
         return sx_response(html)
 
@@ -42,7 +42,7 @@ def register():
     @bp.get("/description/view/")
     @require_admin
     async def calendar_description_view(calendar_slug: str, **kwargs):
-        from sx.sx_components import render_calendar_description
+        from sxc.pages import render_calendar_description
         html = await render_calendar_description(g.calendar)
         return sx_response(html)