Phase 6: Replace render_template() with s-expression rendering in all GET routes

Migrate ~52 GET route handlers across all 7 services from Jinja
render_template() to s-expression component rendering. Each service
gets a sexp_components.py with page/oob/cards render functions.

- Add per-service sexp_components.py (account, blog, cart, events,
  federation, market, orders) with full page, OOB, and pagination
  card rendering
- Add shared/sexp/helpers.py with call_url, root_header_html,
  full_page, oob_page utilities
- Update all GET routes to use get_template_context() + render fns
- Fix get_template_context() to inject Jinja globals (URL helpers)
- Add qs_filter to base_context for sexp filter URL building
- Mount sexp_components.py in docker-compose.dev.yml for all services
- Import sexp_components in app.py for Hypercorn --reload watching
- Fix route_prefix import (shared.utils not shared.infrastructure.urls)
- Fix federation choose-username missing actor in context
- Fix market page_markets missing post in context

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

cart/bp/orders/routes.py

@@ -136,24 +136,30 @@ def register(url_prefix: str) -> Blueprint:
         result = await g.s.execute(stmt)
         orders = result.scalars().all()
 
-        context = {
-            "orders": orders,
-            "page": page,
-            "total_pages": total_pages,
-            "search": search,
-            "search_count": total_count,  # For search display
-        }
+        from shared.sexp.page import get_template_context
+        from sexp_components import (
+            render_orders_page,
+            render_orders_rows,
+            render_orders_oob,
+        )
+
+        ctx = await get_template_context()
+        qs_fn = makeqs_factory()
 
-        # Determine which template to use based on request type and pagination
         if not is_htmx_request():
-            # Normal browser request: full page with layout
-            html = await render_template("_types/orders/index.html", **context)
+            html = await render_orders_page(
+                ctx, orders, page, total_pages, search, total_count,
+                url_for, qs_fn,
+            )
         elif page > 1:
-            # HTMX pagination: just table rows + sentinel
-            html = await render_template("_types/orders/_rows.html", **context)
+            html = await render_orders_rows(
+                ctx, orders, page, total_pages, url_for, qs_fn,
+            )
         else:
-            # HTMX navigation (page 1): main panel + OOB elements
-            html = await render_template("_types/orders/_oob_elements.html", **context)
+            html = await render_orders_oob(
+                ctx, orders, page, total_pages, search, total_count,
+                url_for, qs_fn,
+            )
 
         resp = await make_response(html)
         resp.headers["Hx-Push-Url"] = _current_url_without_page()