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/app.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import path_setup  # noqa: F401  # adds shared/ to sys.path
-import sx.sx_components as sx_components  # noqa: F401  # ensure Hypercorn --reload watches this file
 from pathlib import Path
 
 from quart import g, abort, request