feat: add markets and payments management pages

- New markets blueprint at /<slug>/markets/ with create/delete
- New payments blueprint at /<slug>/payments/ with SumUp config
- Register both in events app with context processor for markets
- Remove PageConfig feature flag check from calendar creation
  (feature toggles replaced by direct management pages)

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

templates/_types/markets/_main_panel.html

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+<section class="p-4">
+    {% if has_access('markets.create_market') %}
+      <div id="market-create-errors" class="mt-2 text-sm text-red-600"></div>
+
+      <form
+        class="mt-4 flex gap-2 items-end"
+        hx-post="{{ url_for('markets.create_market') }}"
+        hx-target="#markets-list"
+        hx-select="#markets-list"
+        hx-swap="outerHTML"
+        hx-on::before-request="document.querySelector('#market-create-errors').textContent='';"
+        hx-on::response-error="document.querySelector('#market-create-errors').innerHTML = event.detail.xhr.responseText;"
+      >
+        <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+        <div class="flex-1">
+          <label class="block text-sm text-gray-600">Name</label>
+          <input name="name" type="text" required class="w-full border rounded px-3 py-2" placeholder="e.g. Farm Shop, Bakery" />
+        </div>
+        <button type="submit" class="border rounded px-3 py-2">Add market</button>
+      </form>
+    {% endif %}
+    <div id="markets-list" class="mt-6">
+      {% include "_types/markets/_markets_list.html" %}
+    </div>
+  </section>

templates/_types/markets/_markets_list.html

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+  {% for m in markets %}
+    <div class="mt-6 border rounded-lg p-4">
+      <div class="flex items-center justify-between gap-3">
+
+        {% set market_href = market_url('/' + post.slug + '/' + m.slug + '/') %}
+        <a
+          class="flex items-baseline gap-3"
+          href="{{ market_href }}"
+        >
+          <h3 class="font-semibold">{{ m.name }}</h3>
+          <h4 class="text-gray-500">/{{ m.slug }}/</h4>
+        </a>
+
+        <button
+          class="text-sm border rounded px-3 py-1 hover:bg-red-50 hover:border-red-400"
+          data-confirm
+          data-confirm-title="Delete market?"
+          data-confirm-text="Products will be hidden (soft delete)"
+          data-confirm-icon="warning"
+          data-confirm-confirm-text="Yes, delete it"
+          data-confirm-cancel-text="Cancel"
+          data-confirm-event="confirmed"
+          hx-delete="{{ url_for('markets.delete_market', market_slug=m.slug) }}"
+          hx-trigger="confirmed"
+          hx-target="#markets-list"
+          hx-select="#markets-list"
+          hx-swap="outerHTML"
+          hx-headers='{"X-CSRFToken":"{{ csrf_token() }}"}'
+        >
+          <i class="fa-solid fa-trash"></i>
+        </button>
+
+      </div>
+    </div>
+  {% else %}
+    <p class="text-gray-500 mt-4">No markets yet. Create one above.</p>
+  {% endfor %}

templates/_types/markets/_nav.html

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+{% from 'macros/admin_nav.html' import placeholder_nav %}
+{{ placeholder_nav() }}

templates/_types/markets/_oob_elements.html

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+{% extends 'oob_elements.html' %}
+
+{% from '_types/root/_oob_menu.html' import mobile_menu with context %}
+
+{% block oobs %}
+  {% from '_types/root/_n/macros.html' import oob_header with context %}
+  {{oob_header('post-admin-header-child', 'markets-header-child', '_types/markets/header/_header.html')}}
+
+  {% from '_types/post/admin/header/_header.html' import header_row with context %}
+  {{ header_row(oob=True) }}
+{% endblock %}
+
+{% block mobile_menu %}
+  {% include '_types/markets/_nav.html' %}
+{% endblock %}
+
+{% block content %}
+  {% include "_types/markets/_main_panel.html" %}
+{% endblock %}

templates/_types/markets/header/_header.html

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+{% import 'macros/links.html' as links %}
+{% macro header_row(oob=False) %}
+  {% call links.menu_row(id='markets-row', oob=oob) %}
+    {% call links.link(url_for('markets.home'), hx_select_search) %}
+      <i class="fa fa-shopping-bag" aria-hidden="true"></i>
+      <div>
+        Markets
+      </div>
+    {% endcall %}
+    {% call links.desktop_nav() %}
+      {% include '_types/markets/_nav.html' %}
+    {% endcall %}
+  {% endcall %}
+{% endmacro %}

templates/_types/markets/index.html

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+{% extends '_types/root/_index.html' %}
+
+{% block meta %}{% endblock %}
+
+{% block root_header_child %}
+  {% from '_types/root/_n/macros.html' import index_row with context %}
+  {% call index_row('post-header-child', '_types/post/header/_header.html') %}
+    {% call index_row('markets-header-child', '_types/markets/header/_header.html') %}
+      {% block markets_header_child %}
+      {% endblock %}
+    {% endcall %}
+  {% endcall %}
+{% endblock %}
+
+{% block _main_mobile_menu %}
+  {% include '_types/markets/_nav.html' %}
+{% endblock %}
+
+{% block content %}
+  {% include '_types/markets/_main_panel.html' %}
+{% endblock %}

templates/_types/payments/_main_panel.html

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+<section class="p-4 max-w-lg mx-auto">
+  <div id="payments-panel" class="space-y-4 p-4 bg-white rounded-lg border border-stone-200">
+    <h3 class="text-lg font-semibold text-stone-800">
+      <i class="fa fa-credit-card text-purple-600 mr-1"></i>
+      SumUp Payment
+    </h3>
+    <p class="text-xs text-stone-400">
+      Configure per-page SumUp credentials. Leave blank to use the global merchant account.
+    </p>
+
+    <form
+      hx-put="{{ url_for('payments.update_sumup') }}"
+      hx-target="#payments-panel"
+      hx-swap="outerHTML"
+      hx-select="#payments-panel"
+      class="space-y-3"
+    >
+      <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+
+      <div>
+        <label class="block text-xs font-medium text-stone-600 mb-1">Merchant Code</label>
+        <input
+          type="text"
+          name="merchant_code"
+          value="{{ sumup_merchant_code }}"
+          placeholder="e.g. ME4J6100"
+          class="w-full px-3 py-1.5 text-sm border border-stone-300 rounded focus:ring-purple-500 focus:border-purple-500"
+        >
+      </div>
+
+      <div>
+        <label class="block text-xs font-medium text-stone-600 mb-1">API Key</label>
+        <input
+          type="password"
+          name="api_key"
+          value=""
+          placeholder="{{ '--------' if sumup_configured else 'sup_sk_...' }}"
+          class="w-full px-3 py-1.5 text-sm border border-stone-300 rounded focus:ring-purple-500 focus:border-purple-500"
+        >
+        {% if sumup_configured %}
+        <p class="text-xs text-stone-400 mt-0.5">Key is set. Leave blank to keep current key.</p>
+        {% endif %}
+      </div>
+
+      <div>
+        <label class="block text-xs font-medium text-stone-600 mb-1">Checkout Reference Prefix</label>
+        <input
+          type="text"
+          name="checkout_prefix"
+          value="{{ sumup_checkout_prefix }}"
+          placeholder="e.g. ROSE-"
+          class="w-full px-3 py-1.5 text-sm border border-stone-300 rounded focus:ring-purple-500 focus:border-purple-500"
+        >
+      </div>
+
+      <button
+        type="submit"
+        class="px-4 py-1.5 text-sm font-medium text-white bg-purple-600 rounded hover:bg-purple-700 focus:ring-2 focus:ring-purple-500"
+      >
+        Save SumUp Settings
+      </button>
+
+      {% if sumup_configured %}
+      <span class="ml-2 text-xs text-green-600">
+        <i class="fa fa-check-circle"></i> Connected
+      </span>
+      {% endif %}
+    </form>
+  </div>
+</section>

templates/_types/payments/_nav.html

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+{% from 'macros/admin_nav.html' import placeholder_nav %}
+{{ placeholder_nav() }}

templates/_types/payments/_oob_elements.html

@@ -0,0 +1,19 @@
+{% extends 'oob_elements.html' %}
+
+{% from '_types/root/_oob_menu.html' import mobile_menu with context %}
+
+{% block oobs %}
+  {% from '_types/root/_n/macros.html' import oob_header with context %}
+  {{oob_header('post-admin-header-child', 'payments-header-child', '_types/payments/header/_header.html')}}
+
+  {% from '_types/post/admin/header/_header.html' import header_row with context %}
+  {{ header_row(oob=True) }}
+{% endblock %}
+
+{% block mobile_menu %}
+  {% include '_types/payments/_nav.html' %}
+{% endblock %}
+
+{% block content %}
+  {% include "_types/payments/_main_panel.html" %}
+{% endblock %}

templates/_types/payments/header/_header.html

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+{% import 'macros/links.html' as links %}
+{% macro header_row(oob=False) %}
+  {% call links.menu_row(id='payments-row', oob=oob) %}
+    {% call links.link(url_for('payments.home'), hx_select_search) %}
+      <i class="fa fa-credit-card" aria-hidden="true"></i>
+      <div>
+        Payments
+      </div>
+    {% endcall %}
+    {% call links.desktop_nav() %}
+      {% include '_types/payments/_nav.html' %}
+    {% endcall %}
+  {% endcall %}
+{% endmacro %}

templates/_types/payments/index.html

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+{% extends '_types/root/_index.html' %}
+
+{% block meta %}{% endblock %}
+
+{% block root_header_child %}
+  {% from '_types/root/_n/macros.html' import index_row with context %}
+  {% call index_row('post-header-child', '_types/post/header/_header.html') %}
+    {% call index_row('payments-header-child', '_types/payments/header/_header.html') %}
+      {% block payments_header_child %}
+      {% endblock %}
+    {% endcall %}
+  {% endcall %}
+{% endblock %}
+
+{% block _main_mobile_menu %}
+  {% include '_types/payments/_nav.html' %}
+{% endblock %}
+
+{% block content %}
+  {% include '_types/payments/_main_panel.html' %}
+{% endblock %}