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/day/routes.py

@@ -123,7 +123,7 @@ def register():
             - pending only for current user/session
         """
         from shared.sx.page import get_template_context
-        from sx.sx_components import render_day_page, render_day_oob
+        from sxc.pages import render_day_page, render_day_oob
 
         tctx = await get_template_context()
         if not is_htmx_request():