Delete last sx_components.py files: relations + test (phase 9)

Move relations component loading into app.py. Move test rendering
functions to test/sxc/pages/__init__.py, update route imports, and
delete both sx_components.py files. Zero sx_components imports remain.

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

relations/app.py

@@ -1,7 +1,5 @@
 from __future__ import annotations
 import path_setup  # noqa: F401
-import sx.sx_components as sx_components  # noqa: F401  # ensure Hypercorn --reload watches this file
-
 from shared.infrastructure.factory import create_base_app
 
 from bp import register_actions, register_data
@@ -14,6 +12,10 @@ def create_app() -> "Quart":
         domain_services_fn=register_domain_services,
     )
 
+    import os
+    from shared.sx.jinja_bridge import load_service_components
+    load_service_components(os.path.dirname(__file__), service_name="relations")
+
     app.register_blueprint(register_actions())
     app.register_blueprint(register_data())
 

relations/sx/sx_components.py

@@ -1,14 +0,0 @@
-"""
-Relations service s-expression components.
-
-Loads relation-specific .sx components and handlers.
-"""
-from __future__ import annotations
-
-import os
-
-from shared.sx.jinja_bridge import load_service_components
-
-# Load relations-specific .sx components + handlers at import time
-load_service_components(os.path.dirname(os.path.dirname(__file__)),
-                        service_name="relations")