refactor: UI improvements and code cleanup

Frontend:
- DetectionsList: Simplify columns, improve truncation and display for IPs, hosts, bot info
- IncidentsView: Replace metric cards with compact stat cards (unique IPs, known bots, ML anomalies, threat levels)
- InvestigationView: Add section navigation anchors, reorganize layout with proper IDs
- ThreatIntelView: Add navigation links to investigation pages, add comment column, improve table layout

Backend:
- Various route and model adjustments
- Configuration updates

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

backend/database.py

@@ -40,11 +40,6 @@ class ClickHouseClient:
         client = self.connect()
         return client.query(query, params)
     
-    def query_df(self, query: str, params: Optional[dict] = None):
-        """Exécute une requête et retourne un DataFrame"""
-        client = self.connect()
-        return client.query_df(query, params)
-    
     def close(self):
         """Ferme la connexion"""
         if self._client: