Refaktor 4/4: admin kao Blueprint-ovi + auto-meni

Admin stranica app-a živi u folderu app-a:
- idriz/apps/superheroji/admin.py (Flask Blueprint BP + NAV), template preseljen u
  idriz/apps/superheroji/templates/superheroji.html.
- admin/app.py: registruje sve iz ADMIN_APPS, lijevi meni se puni iz njihovih NAV
  (context processor), globalni before_request štiti i Blueprint rute.
- Uklonjena inline /superheroji ruta i hardkodiran link u base.html.

Dodavanje admin stranice novom app-u = admin.py (BP+NAV) u folderu app-a + upis u
ADMIN_APPS. Time je mini-app potpuno samostalan: prompt, tools, config i admin.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LzKpYaEsuWDevuNnvSjcFW

admin/templates/base.html

@@ -98,9 +98,11 @@
         <a href="{{ url_for('status') }}" class="{{ 'active' if active_page == 'status' else '' }}">
           <span class="icon">●</span> Status servisa
         </a>
-        <a href="{{ url_for('superheroji') }}" class="{{ 'active' if active_page == 'superheroji' else '' }}">
-          <span class="icon">★</span> Superheroji
+        {% for it in nav_apps %}
+        <a href="{{ url_for(it.endpoint) }}" class="{{ 'active' if active_page == it.page else '' }}">
+          <span class="icon">{{ it.icon }}</span> {{ it.title }}
         </a>
+        {% endfor %}
       </nav>
       <div class="sidebar-foot">
         {% if session.user %}<a href="{{ url_for('logout') }}">↩ Odjava</a>{% endif %}