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

Phase 6 of the zero-Python-rendering plan. All 46 rendering functions
move from market/sx/sx_components.py into market/sxc/pages/__init__.py.
Route handlers import from sxc.pages instead. load_service_components
call moves into _load_market_page_files.

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

market/app.py

@@ -1,6 +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