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>

market/bp/all_markets/routes.py

@@ -55,10 +55,14 @@ def register() -> Blueprint:
             page=page,
         )
 
+        from shared.sexp.page import get_template_context
+        from sexp_components import render_all_markets_page, render_all_markets_oob
+
+        tctx = await get_template_context()
         if is_htmx_request():
-            html = await render_template("_types/all_markets/_main_panel.html", **ctx)
+            html = await render_all_markets_oob(tctx, markets, has_more, page_info, page)
         else:
-            html = await render_template("_types/all_markets/index.html", **ctx)
+            html = await render_all_markets_page(tctx, markets, has_more, page_info, page)
 
         return await make_response(html, 200)
 
@@ -67,13 +71,8 @@ def register() -> Blueprint:
         page = int(request.args.get("page", 1))
         markets, has_more, page_info = await _load_markets(page)
 
-        html = await render_template(
-            "_types/all_markets/_cards.html",
-            markets=markets,
-            has_more=has_more,
-            page_info=page_info,
-            page=page,
-        )
+        from sexp_components import render_all_markets_cards
+        html = await render_all_markets_cards(markets, has_more, page_info, page)
         return await make_response(html, 200)
 
     return bp