Auto-mount defpages: eliminate Python route stubs across all 9 services

Defpages are now declared with absolute paths in .sx files and auto-mounted
directly on the Quart app, removing ~850 lines of blueprint mount_pages calls,
before_request hooks, and g.* wrapper boilerplate. A new page = one defpage
declaration, nothing else.

Infrastructure:
- async_eval awaits coroutine results from callable dispatch
- auto_mount_pages() mounts all registered defpages on the app
- g._defpage_ctx pattern passes helper data to layout context

Migrated: sx, account, orders, federation, cart, market, events, blog

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

blog/bp/admin/routes.py

@@ -3,13 +3,9 @@ from __future__ import annotations
 #from quart import Blueprint, g
 
 from quart import (
-    render_template,
-    make_response,
     Blueprint,
     redirect,
     url_for,
-    request,
-    jsonify
 )
 from shared.browser.app.redis_cacher import clear_all_cache
 from shared.browser.app.authz import require_admin
@@ -27,23 +23,6 @@ def register(url_prefix):
         "base_title": f"{config()['title']} settings",
       }
 
-    @bp.before_request
-    async def _prepare_page_data():
-        ep = request.endpoint or ""
-        if "defpage_settings_home" in ep:
-            from shared.sx.page import get_template_context
-            from sx.sx_components import _settings_main_panel_sx
-            tctx = await get_template_context()
-            g.settings_content = _settings_main_panel_sx(tctx)
-        elif "defpage_cache_page" in ep:
-            from shared.sx.page import get_template_context
-            from sx.sx_components import _cache_main_panel_sx
-            tctx = await get_template_context()
-            g.cache_content = _cache_main_panel_sx(tctx)
-
-    from shared.sx.pages import mount_pages
-    mount_pages(bp, "blog", names=["settings-home", "cache-page"])
-
     @bp.post("/cache_clear/")
     @require_admin
     async def cache_clear():
@@ -54,7 +33,7 @@ def register(url_prefix):
             html = render_comp("cache-cleared", time_str=now.strftime("%H:%M:%S"))
             return sx_response(html)
 
-        return redirect(url_for("settings.defpage_cache_page"))
+        return redirect(url_for("defpage_cache_page"))
     return bp