Add password change functionality and profile image upload

- Add profile_image field to Profile model with default value
- Update profile edit route to handle profile image file uploads
- Add password change route with validation in auth module
- Create change password template with form
- Update profile template to include image upload with preview
- Add password change link to admin sidebar
- Update homepage to use dynamic profile image from database

templates/admin/base.html

@@ -100,6 +100,9 @@
                 <i class="fas fa-share-alt me-2"></i>Link Social
             </a>
             <hr class="border-white my-3 mx-3">
+            <a href="{{ url_for('auth.change_password') }}" class="{% if request.endpoint == 'auth.change_password' %}active{% endif %}">
+                <i class="fas fa-key me-2"></i>Cambia Password
+            </a>
             <a href="{{ url_for('route_home.home') }}" target="_blank">
                 <i class="fas fa-external-link-alt me-2"></i>Visualizza Sito
             </a>

templates/admin/profile.html

@@ -6,7 +6,7 @@
 {% block content %}
 <div class="card">
     <div class="card-body">
-        <form method="POST" action="{{ url_for('admin.profile_edit') }}">
+        <form method="POST" action="{{ url_for('admin.profile_edit') }}" enctype="multipart/form-data">
             <div class="mb-3">
                 <label for="title" class="form-label">Titolo</label>
                 <input type="text" class="form-control" id="title" name="title"
@@ -40,6 +40,29 @@
                        value="{{ profile.cv_url if profile else '' }}">
             </div>
 
+            <div class="mb-3">
+                <label class="form-label">Immagine di Profilo</label>
+                <div class="row">
+                    <div class="col-md-6">
+                        <label for="profile_image_file" class="form-label text-muted small">Upload Immagine</label>
+                        <input type="file" class="form-control" id="profile_image_file" name="profile_image_file" accept="image/*">
+                        <small class="text-muted">Formati supportati: png, jpg, jpeg, gif, webp (max 16 MB)</small>
+                    </div>
+                    <div class="col-md-6">
+                        <label for="profile_image" class="form-label text-muted small">Oppure inserisci URL manualmente</label>
+                        <input type="text" class="form-control" id="profile_image" name="profile_image"
+                               value="{{ profile.profile_image if profile else '' }}" placeholder="img/personal.webp">
+                        <small class="text-muted">Percorso relativo alla cartella static/</small>
+                    </div>
+                </div>
+                {% if profile and profile.profile_image %}
+                <div class="mt-2">
+                    <small class="text-muted">Immagine attuale:</small><br>
+                    <img src="{{ url_for('static', filename=profile.profile_image) }}" alt="Profile" class="img-thumbnail rounded-circle" style="max-width: 200px; max-height: 200px;">
+                </div>
+                {% endif %}
+            </div>
+
             <div class="d-flex gap-2">
                 <button type="submit" class="btn btn-gradient">
                     <i class="fas fa-save me-2"></i>Salva Modifiche