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>

events/bp/tickets/routes.py

@@ -24,8 +24,6 @@ from shared.sx.helpers import sx_response
 
 from .services.tickets import (
     create_ticket,
-    get_ticket_by_code,
-    get_user_tickets,
     get_available_ticket_count,
     get_tickets_for_entry,
     get_sold_ticket_count,
@@ -39,44 +37,6 @@ logger = logging.getLogger(__name__)
 def register() -> Blueprint:
     bp = Blueprint("tickets", __name__, url_prefix="/tickets")
 
-    @bp.before_request
-    async def _prepare_page_data():
-        ep = request.endpoint or ""
-        if "defpage_my_tickets" in ep:
-            ident = current_cart_identity()
-            tickets = await get_user_tickets(
-                g.s,
-                user_id=ident["user_id"],
-                session_id=ident["session_id"],
-            )
-            from shared.sx.page import get_template_context
-            from sx.sx_components import _tickets_main_panel_html
-            ctx = await get_template_context()
-            g.tickets_content = _tickets_main_panel_html(ctx, tickets)
-        elif "defpage_ticket_detail" in ep:
-            code = (request.view_args or {}).get("code")
-            ticket = await get_ticket_by_code(g.s, code) if code else None
-            if not ticket:
-                from quart import abort
-                abort(404)
-            # Verify ownership
-            ident = current_cart_identity()
-            if ident["user_id"] is not None:
-                if ticket.user_id != ident["user_id"]:
-                    from quart import abort
-                    abort(404)
-            elif ident["session_id"] is not None:
-                if ticket.session_id != ident["session_id"]:
-                    from quart import abort
-                    abort(404)
-            else:
-                from quart import abort
-                abort(404)
-            from shared.sx.page import get_template_context
-            from sx.sx_components import _ticket_detail_panel_html
-            ctx = await get_template_context()
-            g.ticket_detail_content = _ticket_detail_panel_html(ctx, ticket)
-
     @bp.post("/buy/")
     @clear_cache(tag="calendars", tag_scope="all")
     async def buy_tickets():