feat(ui): platform control panel and styled auth screens

Add the `controlpanel` app: a platform-wide (not club-scoped) admin panel for
creating clubs, archiving/restoring them, managing club admins, and per-club
statistics (members, teams & staff, events, shop). Statistics are annotated in
one query so the club list cannot fan out into N+1, and are returned as stat
*groups* so growing the domain means adding one entry.

Two access rules, both enforced by PlatformStaffRequiredMixin:
- staff only (is_staff/is_superuser); anonymous are sent to login, signed-in
  non-staff get a 403. Staff already need a second factor, so the panel is
  2FA-protected for free.
- base domain only: the panel manages *all* clubs, so it 404s if the tenant
  middleware resolved a club from the subdomain.

Granting admin to an unknown email creates the account (unusable password —
they set one via password reset) and the Member behind it, since a ClubRole
hangs off a Member. A member who already holds a role is promoted in place,
because there is only one role per member per club.

UI is Tailwind + daisyUI. allauth ships an element system, so overriding
allauth/layouts/base.html plus ~13 element partials restyles *every* auth and
2FA screen at once — login, signup, password reset, the 2FA challenge, TOTP
enrolment, passkeys and recovery codes — rather than templating 20+ pages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

templates/allauth/elements/alert.html

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+{% load allauth %}
+<div class="alert {% if attrs.level == 'error' %}alert-error{% elif attrs.level == 'warning' %}alert-warning{% elif attrs.level == 'success' %}alert-success{% else %}alert-info{% endif %} my-2">
+    <span>{% slot message %}{% endslot %}</span>
+</div>

templates/allauth/elements/badge.html

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+{% load allauth %}<span class="badge badge-neutral">{% slot %}{% endslot %}</span>

templates/allauth/elements/button.html

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+{% load allauth %}
+{% comment %} djlint:off {% endcomment %}
+<{% if attrs.href %}a href="{{ attrs.href }}"{% else %}button{% endif %}
+class="btn {% if attrs.tags and 'danger' in attrs.tags %}btn-error{% elif attrs.tags and 'secondary' in attrs.tags %}btn-ghost{% elif attrs.tags and 'link' in attrs.tags %}btn-link{% else %}btn-primary{% endif %}"
+{% if attrs.form %}form="{{ attrs.form }}"{% endif %}
+{% if attrs.id %}id="{{ attrs.id }}"{% endif %}
+{% if attrs.name %}name="{{ attrs.name }}"{% endif %}
+{% if attrs.value %}value="{{ attrs.value }}"{% endif %}
+{% if attrs.type %}type="{{ attrs.type }}"{% endif %}
+>
+{% slot %}
+{% endslot %}
+</{% if attrs.href %}a{% else %}button{% endif %}>

templates/allauth/elements/button_group.html

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+{% load allauth %}
+<div class="flex flex-wrap gap-2">
+    {% slot %}{% endslot %}
+</div>

templates/allauth/elements/details.html

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+{% load allauth %}
+<details class="collapse-arrow collapse border border-base-300 bg-base-100 my-2" {% if attrs.open %}open{% endif %}>
+    <summary class="collapse-title font-medium">{% slot summary %}{% endslot %}</summary>
+    <div class="collapse-content">{% slot body %}{% endslot %}</div>
+</details>

templates/allauth/elements/fields.html

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+{% load ui %}
+{% for field in attrs.form.hidden_fields %}{{ field }}{% endfor %}
+{% for error in attrs.form.non_field_errors %}
+    <div class="alert alert-error my-2">
+        <span>{{ error }}</span>
+    </div>
+{% endfor %}
+{% for field in attrs.form.visible_fields %}
+    <div class="form-control my-3 w-full">
+        {% if field.field.widget.input_type == "checkbox" %}
+            <label class="label cursor-pointer justify-start gap-3" for="{{ field.id_for_label }}">
+                {{ field|daisy }}
+                <span class="label-text">{{ field.label }}</span>
+            </label>
+        {% else %}
+            <label class="label" for="{{ field.id_for_label }}">
+                <span class="label-text">{{ field.label }}</span>
+            </label>
+            {{ field|daisy }}
+        {% endif %}
+        {% if field.help_text %}<span class="label-text-alt mt-1 text-base-content/70">{{ field.help_text }}</span>{% endif %}
+        {% for error in field.errors %}<span class="label-text-alt mt-1 text-error">{{ error }}</span>{% endfor %}
+    </div>
+{% endfor %}

templates/allauth/elements/form.html

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+{% load allauth %}
+<form method="{{ attrs.method }}"
+      {% if attrs.action %}action="{{ attrs.action }}"{% endif %}
+      class="space-y-2">
+    {% slot body %}{% endslot %}
+    <div class="card-actions justify-end pt-3">
+        {% slot actions %}{% endslot %}
+    </div>
+</form>

templates/allauth/elements/h1.html

@@ -0,0 +1 @@
+{% comment %} djlint:off {% endcomment %}{% load allauth %}<h1 class="card-title text-2xl">{% slot %}{% endslot %}</h1>

templates/allauth/elements/h2.html

@@ -0,0 +1 @@
+{% comment %} djlint:off {% endcomment %}{% load allauth %}<h2 class="text-xl font-semibold">{% slot %}{% endslot %}</h2>

templates/allauth/elements/hr.html

@@ -0,0 +1 @@
+{% comment %} djlint:off {% endcomment %}{% load allauth %}<div class="divider"></div>

templates/allauth/elements/p.html

@@ -0,0 +1 @@
+{% comment %} djlint:off {% endcomment %}{% load allauth %}<p class="text-base-content/80">{% slot %}{% endslot %}</p>

templates/allauth/elements/panel.html

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+{% load allauth %}
+<div class="card border border-base-300 bg-base-100 my-4">
+    <div class="card-body gap-2">
+        {% if slots.title %}<h2 class="card-title text-lg">{% slot title %}{% endslot %}</h2>{% endif %}
+        <div>{% slot body %}{% endslot %}</div>
+        {% if slots.actions %}<div class="card-actions justify-end">{% slot actions %}{% endslot %}</div>{% endif %}
+    </div>
+</div>

templates/allauth/elements/table.html

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+{% load allauth %}
+<div class="overflow-x-auto">
+    <table class="table">
+        {% slot %}{% endslot %}
+    </table>
+</div>

templates/allauth/layouts/base.html

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+{% extends "base.html" %}
+
+{% block title %}
+    {% block head_title %}{% endblock head_title %} · ClubManager
+{% endblock title %}
+
+{% block main %}
+    <div class="flex justify-center">
+        <div class="card w-full max-w-xl bg-base-100 shadow">
+            <div class="card-body prose max-w-none">
+                {% block content %}{% endblock content %}
+            </div>
+        </div>
+    </div>
+{% endblock main %}