Decouple all cross-app service calls to HTTP endpoints

Replace every direct cross-app services.* call with HTTP-based
communication: call_action() for writes, fetch_data() for reads.
Each app now registers only its own domain service.

Infrastructure:
- shared/infrastructure/actions.py — POST client for /internal/actions/
- shared/infrastructure/data_client.py — GET client for /internal/data/
- shared/contracts/dtos.py — dto_to_dict/dto_from_dict serialization

Action endpoints (writes):
- events: 8 handlers (ticket adjust, claim/confirm, toggle, adopt)
- market: 2 handlers (create/soft-delete marketplace)
- cart: 1 handler (adopt cart for user)

Data endpoints (reads):
- blog: 4 (post-by-slug/id, posts-by-ids, search-posts)
- events: 10 (pending entries/tickets, entries/tickets for page/order,
  entry-ids, associated-entries, calendars, visible-entries-for-period)
- market: 1 (marketplaces-for-container)
- cart: 1 (cart-summary)

Service registration cleanup:
- blog→blog+federation, events→calendar+federation,
  market→market+federation, cart→cart only,
  federation→federation only, account→nothing
- Stubs reduced to minimal StubFederationService

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

events/app.py

@@ -8,7 +8,7 @@ from jinja2 import FileSystemLoader, ChoiceLoader
 
 from shared.infrastructure.factory import create_base_app
 
-from bp import register_all_events, register_calendars, register_markets, register_payments, register_page, register_fragments
+from bp import register_all_events, register_calendars, register_markets, register_payments, register_page, register_fragments, register_actions, register_data
 
 
 async def events_context() -> dict:
@@ -20,20 +20,25 @@ async def events_context() -> dict:
     """
     from shared.infrastructure.context import base_context
     from shared.services.navigation import get_navigation_tree
-    from shared.services.registry import services
     from shared.infrastructure.cart_identity import current_cart_identity
     from shared.infrastructure.fragments import fetch_fragments
+    from shared.infrastructure.data_client import fetch_data
+    from shared.contracts.dtos import CartSummaryDTO, dto_from_dict
 
     ctx = await base_context()
 
     # Fallback for _nav.html when nav-tree fragment fetch fails
     ctx["menu_items"] = await get_navigation_tree(g.s)
 
-    # Cart data via service (replaces cross-app HTTP API)
+    # Cart data via internal data endpoint
     ident = current_cart_identity()
-    summary = await services.cart.cart_summary(
-        g.s, user_id=ident["user_id"], session_id=ident["session_id"],
-    )
+    summary_params = {}
+    if ident["user_id"] is not None:
+        summary_params["user_id"] = ident["user_id"]
+    if ident["session_id"] is not None:
+        summary_params["session_id"] = ident["session_id"]
+    raw = await fetch_data("cart", "cart-summary", params=summary_params, required=False)
+    summary = dto_from_dict(CartSummaryDTO, raw) if raw else CartSummaryDTO()
     ctx["cart_count"] = summary.count + summary.calendar_count + summary.ticket_count
     ctx["cart_total"] = float(summary.total + summary.calendar_total + summary.ticket_total)
 
@@ -58,7 +63,6 @@ async def events_context() -> dict:
 
 
 def create_app() -> "Quart":
-    from shared.services.registry import services
     from services import register_domain_services
 
     app = create_base_app(
@@ -105,6 +109,8 @@ def create_app() -> "Quart":
     )
 
     app.register_blueprint(register_fragments())
+    app.register_blueprint(register_actions())
+    app.register_blueprint(register_data())
 
     # --- Auto-inject slug into url_for() calls ---
     @app.url_value_preprocessor
@@ -122,31 +128,39 @@ def create_app() -> "Quart":
     # --- Load post data for slug ---
     @app.before_request
     async def hydrate_post():
+        from shared.infrastructure.data_client import fetch_data
         slug = getattr(g, "post_slug", None)
         if not slug:
             return
-        post = await services.blog.get_post_by_slug(g.s, slug)
+        post = await fetch_data("blog", "post-by-slug", params={"slug": slug})
         if not post:
             abort(404)
         g.post_data = {
             "post": {
-                "id": post.id,
-                "title": post.title,
-                "slug": post.slug,
-                "feature_image": post.feature_image,
-                "status": post.status,
-                "visibility": post.visibility,
+                "id": post["id"],
+                "title": post["title"],
+                "slug": post["slug"],
+                "feature_image": post.get("feature_image"),
+                "status": post["status"],
+                "visibility": post["visibility"],
             },
         }
 
     @app.context_processor
     async def inject_post():
+        from shared.infrastructure.data_client import fetch_data
+        from shared.contracts.dtos import CalendarDTO, MarketPlaceDTO, dto_from_dict
+        from shared.services.registry import services
         post_data = getattr(g, "post_data", None)
         if not post_data:
             return {}
         post_id = post_data["post"]["id"]
+        # Calendar data is local (events owns it)
         calendars = await services.calendar.calendars_for_container(g.s, "page", post_id)
-        markets = await services.market.marketplaces_for_container(g.s, "page", post_id)
+        # Market data is cross-app
+        raw_markets = await fetch_data("market", "marketplaces-for-container",
+                                       params={"type": "page", "id": post_id}, required=False) or []
+        markets = [dto_from_dict(MarketPlaceDTO, m) for m in raw_markets]
         return {
             **post_data,
             "calendars": calendars,
@@ -168,6 +182,7 @@ def create_app() -> "Quart":
         from quart import jsonify
         from shared.infrastructure.urls import events_url
         from shared.infrastructure.oembed import build_oembed_response
+        from shared.infrastructure.data_client import fetch_data
 
         url = request.args.get("url", "")
         if not url:
@@ -178,15 +193,15 @@ def create_app() -> "Quart":
         if not slug:
             return jsonify({"error": "could not extract slug"}), 404
 
-        post = await services.blog.get_post_by_slug(g.s, slug)
+        post = await fetch_data("blog", "post-by-slug", params={"slug": slug})
         if not post:
             return jsonify({"error": "not found"}), 404
 
         resp = build_oembed_response(
-            title=post.title,
+            title=post["title"],
             oembed_type="link",
-            thumbnail_url=post.feature_image,
-            url=events_url(f"/{post.slug}"),
+            thumbnail_url=post.get("feature_image"),
+            url=events_url(f"/{post['slug']}"),
         )
         return jsonify(resp)