Add diary photos and linked patch history

app/templates/concert_detail.html

@@ -392,7 +392,7 @@
                     <h2>📓 Mein Konzerttagebuch</h2>
                     {% if can_write_diary %}
                         <p>Dieser Eintrag ist privat und nur für dich sichtbar.</p>
-                        <form class="diary-form" method="post" action="/concerts/{{ concert.id }}/diary">
+                        <form class="diary-form" method="post" action="/concerts/{{ concert.id }}/diary" enctype="multipart/form-data">
                             <label for="diary-rating">Bewertung</label>
                             <select id="diary-rating" name="rating" required>
                                 {% for value in range(1, 6) %}<option value="{{ value }}" {% if diary_entry and diary_entry.rating == value %}selected{% endif %}>{{ value }} von 5 Sternen</option>{% endfor %}
@@ -401,6 +401,12 @@
                             <input id="favorite-song" name="favorite_song" maxlength="255" value="{{ diary_entry.favorite_song if diary_entry else '' }}">
                             <label for="diary-notes">Erinnerungen <small>(optional)</small></label>
                             <textarea id="diary-notes" name="notes" maxlength="5000" placeholder="Was ist dir von diesem Abend geblieben?">{{ diary_entry.notes if diary_entry else '' }}</textarea>
+                            <label for="diary-photo">Erinnerungsfoto <small>(optional, JPG, PNG oder WEBP, max. 10 MB)</small></label>
+                            {% if diary_entry and diary_entry.photo_path %}
+                                <img src="{{ diary_entry.photo_path }}" alt="Erinnerungsfoto zu {{ concert.artist }}" style="display:block;max-width:min(100%,520px);max-height:420px;object-fit:cover;border-radius:10px;margin-bottom:8px">
+                                <label><input type="checkbox" name="remove_photo" value="1" style="width:auto"> Vorhandenes Foto entfernen</label>
+                            {% endif %}
+                            <input id="diary-photo" name="photo" type="file" accept="image/jpeg,image/png,image/webp">
                             <button class="attendance-option" type="submit">{% if diary_entry %}Eintrag aktualisieren{% else %}Im Tagebuch speichern{% endif %}</button>
                         </form>
                         {% if diary_entry %}<form method="post" action="/concerts/{{ concert.id }}/diary/delete" onsubmit="return confirm('Tagebucheintrag wirklich löschen?');"><button class="button button-secondary" type="submit">Tagebucheintrag löschen</button></form>{% endif %}