Replace inter-service _handlers dicts with declarative sx defquery/defaction

The inter-service data layer (fetch_data/call_action) was the least
structured part of the codebase — Python _handlers dicts with ad-hoc
param extraction scattered across 16 route files. This replaces them
with declarative .sx query/action definitions that make the entire
inter-service protocol self-describing and greppable.

Infrastructure:
- defquery/defaction special forms in the sx evaluator
- Query/action registry with load, lookup, and schema introspection
- Query executor using async_eval with I/O primitives
- Blueprint factories (create_data_blueprint/create_action_blueprint)
  with sx-first dispatch and Python fallback
- /internal/schema endpoint on every service
- parse-datetime and split-ids primitives for type coercion

Service extractions:
- LikesService (toggle, is_liked, liked_slugs, liked_ids)
- PageConfigService (ensure, get_by_container, get_by_id, get_batch, update)
- RelationsService (wraps module-level functions)
- AccountDataService (user_by_email, newsletters)
- CartItemsService, MarketDataService (raw SQLAlchemy lookups)

50 of 54 handlers converted to sx, 4 Python fallbacks remain
(ghost-sync/push-member, clear-cart-for-order, create-order).
Net: -1,383 lines Python, +251 lines modified.

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

events/bp/actions/routes.py

@@ -1,139 +1,15 @@
 """Events app action endpoints.
 
-Exposes write operations at ``/internal/actions/<action_name>`` for
-cross-app callers (cart, blog) via the internal action client.
+All actions are defined declaratively in ``events/actions.sx`` and
+dispatched via the sx query registry.  No Python fallbacks needed.
 """
 from __future__ import annotations
 
-from quart import Blueprint, g, jsonify, request
+from shared.infrastructure.query_blueprint import create_action_blueprint
 
-from shared.infrastructure.actions import ACTION_HEADER
-from shared.services.registry import services
+from quart import Blueprint
 
 
 def register() -> Blueprint:
-    bp = Blueprint("actions", __name__, url_prefix="/internal/actions")
-
-    @bp.before_request
-    async def _require_action_header():
-        if not request.headers.get(ACTION_HEADER):
-            return jsonify({"error": "forbidden"}), 403
-        from shared.infrastructure.internal_auth import validate_internal_request
-        if not validate_internal_request():
-            return jsonify({"error": "forbidden"}), 403
-
-    _handlers: dict[str, object] = {}
-
-    @bp.post("/<action_name>")
-    async def handle_action(action_name: str):
-        handler = _handlers.get(action_name)
-        if handler is None:
-            return jsonify({"error": "unknown action"}), 404
-        try:
-            result = await handler()
-            return jsonify(result)
-        except Exception as exc:
-            import logging
-            logging.getLogger(__name__).exception("Action %s failed", action_name)
-            return jsonify({"error": str(exc)}), 500
-
-    # --- adjust-ticket-quantity ---
-    async def _adjust_ticket_quantity():
-        data = await request.get_json()
-        await services.calendar.adjust_ticket_quantity(
-            g.s,
-            data["entry_id"],
-            data["count"],
-            user_id=data.get("user_id"),
-            session_id=data.get("session_id"),
-            ticket_type_id=data.get("ticket_type_id"),
-        )
-        return {"ok": True}
-
-    _handlers["adjust-ticket-quantity"] = _adjust_ticket_quantity
-
-    # --- claim-entries-for-order ---
-    async def _claim_entries():
-        data = await request.get_json()
-        await services.calendar.claim_entries_for_order(
-            g.s,
-            data["order_id"],
-            data.get("user_id"),
-            data.get("session_id"),
-            data.get("page_post_id"),
-        )
-        return {"ok": True}
-
-    _handlers["claim-entries-for-order"] = _claim_entries
-
-    # --- claim-tickets-for-order ---
-    async def _claim_tickets():
-        data = await request.get_json()
-        await services.calendar.claim_tickets_for_order(
-            g.s,
-            data["order_id"],
-            data.get("user_id"),
-            data.get("session_id"),
-            data.get("page_post_id"),
-        )
-        return {"ok": True}
-
-    _handlers["claim-tickets-for-order"] = _claim_tickets
-
-    # --- confirm-entries-for-order ---
-    async def _confirm_entries():
-        data = await request.get_json()
-        await services.calendar.confirm_entries_for_order(
-            g.s,
-            data["order_id"],
-            data.get("user_id"),
-            data.get("session_id"),
-        )
-        return {"ok": True}
-
-    _handlers["confirm-entries-for-order"] = _confirm_entries
-
-    # --- confirm-tickets-for-order ---
-    async def _confirm_tickets():
-        data = await request.get_json()
-        await services.calendar.confirm_tickets_for_order(
-            g.s, data["order_id"],
-        )
-        return {"ok": True}
-
-    _handlers["confirm-tickets-for-order"] = _confirm_tickets
-
-    # --- toggle-entry-post ---
-    async def _toggle_entry_post():
-        data = await request.get_json()
-        is_associated = await services.calendar.toggle_entry_post(
-            g.s,
-            data["entry_id"],
-            data["content_type"],
-            data["content_id"],
-        )
-        return {"is_associated": is_associated}
-
-    _handlers["toggle-entry-post"] = _toggle_entry_post
-
-    # --- adopt-entries-for-user ---
-    async def _adopt_entries():
-        data = await request.get_json()
-        await services.calendar.adopt_entries_for_user(
-            g.s, data["user_id"], data["session_id"],
-        )
-        return {"ok": True}
-
-    _handlers["adopt-entries-for-user"] = _adopt_entries
-
-    # --- adopt-tickets-for-user ---
-    async def _adopt_tickets():
-        data = await request.get_json()
-        await services.calendar.adopt_tickets_for_user(
-            g.s, data["user_id"], data["session_id"],
-        )
-        return {"ok": True}
-
-    _handlers["adopt-tickets-for-user"] = _adopt_tickets
-
+    bp, _handlers = create_action_blueprint("events")
     return bp