Add booking deletion, crew views, anonymous walk-in, and account claim

- Users can delete their own bookings (confirmation page)
- Crew page tree (/suff/staff/): book/pay/delete for any user, register
  new users, set/reset PINs
- Anonymous walk-in user "anonym": bookings auto-create matching cash
  payment so balance stays at 0
- Self-signup: unknown name creates account (PIN required); known name
  without PIN and no activity allows claim (PIN required); known name
  without PIN but with activity blocks and points to bar crew
- Crew-only PIN set/reset; no random PINs, PINs never displayed
- Cyan .staff-target highlight on all crew pages
- Updated suff.md with current feature state and open ideas

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gaehsnitz/templates/suff/staff_user.html

@@ -0,0 +1,95 @@
+{% extends "suff/base.html" %}
+
+{% block content %}
+<p class="muted">Crew-Ansicht</p>
+<h2>Buchen für <span class="staff-target">{{ tab_user.username }}</span>{% if is_anonymous_target %} (Bar / Anonym){% endif %}</h2>
+
+{% if booked_drink %}
+    <div class="toast" role="status">
+        Gebucht: +1 {{ booked_drink.name }}{% if is_anonymous_target %} (bar bezahlt){% endif %}
+    </div>
+{% endif %}
+
+{% if paid_toast %}
+    <div class="toast" role="status">
+        Zahlung gespeichert.
+    </div>
+{% endif %}
+
+{% if is_anonymous_target %}
+    <p class="muted">Anonyme Buchungen werden automatisch als bar bezahlt eingetragen.</p>
+{% else %}
+    <section class="total-box">
+        <span class="total-label">Rechnung</span>
+        <span class="total-value">{{ total|floatformat:2 }} €</span>
+        {% if paid %}
+            <span class="total-label">Bezahlt</span>
+            <span class="total-value">{{ paid|floatformat:2 }} €</span>
+            <span class="total-label">Offen</span>
+            <span class="total-value">{{ open_balance|floatformat:2 }} €</span>
+        {% endif %}
+    </section>
+
+    {% if open_balance > 0 %}
+        <p><a href="{% url 'suff:staff_pay' tab_user.username %}" class="btn-primary">Zahlung eintragen</a></p>
+    {% endif %}
+{% endif %}
+
+{% if phase == "booking" %}
+    <section>
+        <h3>Getränk buchen</h3>
+        <div class="drink-grid">
+            {% for drink in drinks %}
+                <form method="post" action="{% url 'suff:staff_book' tab_user.username %}">
+                    {% csrf_token %}
+                    <input type="hidden" name="drink_id" value="{{ drink.id }}" />
+                    <button type="submit" class="drink-btn drink-btn-{{ drink.category }}">
+                        <span class="drink-plus">+1</span>
+                        <span class="drink-name">{{ drink.name }}</span>
+                        <span class="drink-price">{{ drink.sale_price_per_bottle|floatformat:2 }} €</span>
+                    </button>
+                </form>
+            {% endfor %}
+        </div>
+    </section>
+{% endif %}
+
+<section>
+    <h3>Bisher gebucht</h3>
+    {% if consumption_list %}
+        {% regroup consumption_list by get_day_display as day_groups %}
+        {% for group in day_groups %}
+            <div class="day-group">
+                <h4 class="day-heading">{{ group.grouper }}</h4>
+                <ul class="history">
+                    {% for c in group.list %}
+                        <li>
+                            <span class="hist-when">{% if c.created_at %}{{ c.created_at|date:"H:i" }}{% else %}—{% endif %}</span>
+                            <span class="hist-what">{{ c.drink.name }}</span>
+                            <span class="hist-price">
+                                {% if c.for_free %}gratis{% else %}{{ c.drink.sale_price_per_bottle|floatformat:2 }} €{% endif %}
+                            </span>
+                            {% if phase == "booking" %}
+                                <a href="{% url 'suff:staff_delete_consumption' tab_user.username c.id %}" class="hist-delete" aria-label="Buchung löschen">🗑</a>
+                            {% endif %}
+                        </li>
+                    {% endfor %}
+                </ul>
+            </div>
+        {% endfor %}
+    {% else %}
+        <div class="empty-state">
+            <p class="empty-emoji">🍺</p>
+            <p>Noch nichts gebucht.</p>
+        </div>
+    {% endif %}
+</section>
+
+<div class="link-row">
+    {% if not is_anonymous_target %}
+        <a href="{% url 'suff:staff_pin_reset' tab_user.username %}" class="link-btn link-btn-secondary">PIN setzen / zurücksetzen</a>
+    {% endif %}
+    <a href="{% url 'suff:staff_index' %}" class="link-btn link-btn-secondary">Anderen Benutzer wählen</a>
+    <a href="{% url 'suff:me' %}" class="link-btn link-btn-secondary">Zurück zu mir</a>
+</div>
+{% endblock %}