Move payments admin from events to cart service

Payments config (SumUp credentials per page) is a cart concern since all
checkouts go through the cart service. Moves it from events.rose-ash.com
to cart.rose-ash.com/<page_slug>/admin/payments/ and adds a cart admin
overview page at /<page_slug>/admin/.

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

events/bp/__init__.py

@@ -2,7 +2,6 @@ from .all_events.routes import register as register_all_events
 from .calendar.routes import register as register_calendar
 from .calendars.routes import register as register_calendars
 from .markets.routes import register as register_markets
-from .payments.routes import register as register_payments
 from .page.routes import register as register_page
 from .fragments import register_fragments
 from .actions import register_actions

events/bp/payments/routes.py

@@ -1,90 +0,0 @@
-from __future__ import annotations
-
-from types import SimpleNamespace
-
-from quart import (
-    render_template, make_response, Blueprint, g, request
-)
-
-from shared.infrastructure.data_client import fetch_data
-from shared.infrastructure.actions import call_action
-from shared.browser.app.authz import require_admin
-from shared.browser.app.utils.htmx import is_htmx_request
-
-
-def register():
-    bp = Blueprint("payments", __name__, url_prefix='/payments')
-
-    @bp.context_processor
-    async def inject_root():
-        return {}
-
-    async def _load_payment_ctx():
-        """Load PageConfig SumUp data for the current page (from blog)."""
-        post = (getattr(g, "post_data", None) or {}).get("post", {})
-        post_id = post.get("id")
-        if not post_id:
-            return {}
-
-        raw_pc = await fetch_data(
-            "blog", "page-config",
-            params={"container_type": "page", "container_id": post_id},
-            required=False,
-        )
-        pc = SimpleNamespace(**raw_pc) if raw_pc else None
-
-        return {
-            "sumup_configured": bool(pc and getattr(pc, "sumup_api_key", None)),
-            "sumup_merchant_code": (getattr(pc, "sumup_merchant_code", None) or "") if pc else "",
-            "sumup_checkout_prefix": (getattr(pc, "sumup_checkout_prefix", None) or "") if pc else "",
-        }
-
-    @bp.get("/")
-    @require_admin
-    async def home(**kwargs):
-        pay_ctx = await _load_payment_ctx()
-
-        from shared.sexp.page import get_template_context
-        from sexp.sexp_components import render_payments_page, render_payments_oob
-
-        ctx = await get_template_context()
-        ctx.update(pay_ctx)
-        if not is_htmx_request():
-            html = await render_payments_page(ctx)
-        else:
-            html = await render_payments_oob(ctx)
-        return await make_response(html)
-
-    @bp.put("/")
-    @require_admin
-    async def update_sumup(**kwargs):
-        """Update SumUp credentials for this page (writes to blog's db_blog)."""
-        post = (getattr(g, "post_data", None) or {}).get("post", {})
-        post_id = post.get("id")
-        if not post_id:
-            return await make_response("Post not found", 404)
-
-        form = await request.form
-        merchant_code = (form.get("merchant_code") or "").strip()
-        api_key = (form.get("api_key") or "").strip()
-        checkout_prefix = (form.get("checkout_prefix") or "").strip()
-
-        payload = {
-            "container_type": "page",
-            "container_id": post_id,
-            "sumup_merchant_code": merchant_code,
-            "sumup_checkout_prefix": checkout_prefix,
-        }
-        if api_key:
-            payload["sumup_api_key"] = api_key
-
-        await call_action("blog", "update-page-config", payload=payload)
-
-        from shared.sexp.page import get_template_context
-        from sexp.sexp_components import render_payments_panel
-        ctx = await get_template_context()
-        ctx.update(await _load_payment_ctx())
-        html = render_payments_panel(ctx)
-        return await make_response(html)
-
-    return bp