Cleanup: Alle Netzwerkanalyse-Reste vollständig entfernt

- 7 JS/CSS-Dateien gelöscht (api_network, app_network, network-graph, network-cluster, cluster-data, network.css, network-cluster.css)
- 2 Backend-Dateien gelöscht (routers/network_analysis.py, models_network.py)
- dashboard.html: Modal Neue Netzwerkanalyse entfernt
- app.js: 15 Netzwerk-Referenzen + kaputte Blöcke bereinigt
- DB-Schema CREATE TABLEs bleiben (geteilte DB mit Netzwerkanalyse-App)

src/static/dashboard.html

@@ -628,34 +628,6 @@
 
 
     <!-- Modal: Neue Netzwerkanalyse -->
-    <div class="modal-overlay" id="modal-network-new" role="dialog" aria-modal="true" aria-labelledby="modal-network-new-title">
-        <div class="modal">
-            <div class="modal-header">
-                <div class="modal-title" id="modal-network-new-title">Neue Netzwerkanalyse</div>
-                <button class="modal-close" onclick="closeModal('modal-network-new')" aria-label="Schließen">&times;</button>
-            </div>
-            <form onsubmit="App.submitNetworkAnalysis(event); return false;">
-                <div class="modal-body">
-                    <div class="form-group">
-                        <label for="network-name">Name der Analyse</label>
-                        <input type="text" id="network-name" required placeholder="z.B. Irankonflikt-Netzwerk">
-                    </div>
-                    <div class="form-group">
-                        <label>Lagen auswählen</label>
-                        <div class="network-incident-list">
-                            <input type="text" class="network-incident-search" id="network-incident-search" placeholder="Lagen durchsuchen...">
-                            <div id="network-incident-options"></div>
-                        </div>
-                    </div>
-                </div>
-                <div class="modal-footer">
-                    <button type="button" class="btn btn-secondary" onclick="closeModal('modal-network-new')">Abbrechen</button>
-                    <button type="submit" class="btn btn-primary" id="network-submit-btn">Analyse starten</button>
-                </div>
-            </form>
-        </div>
-    </div>
-
     <!-- Tutorial -->
     <div class="tutorial-overlay" id="tutorial-overlay">
         <div class="tutorial-spotlight" id="tutorial-spotlight"></div>