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/routes/clustering.py

@@ -6,22 +6,20 @@ Clustering d'IPs multi-métriques — WebGL / deck.gl backend.
 - Calcul en background thread + cache 30 min
 - Endpoints : /clusters, /status, /cluster/{id}/points
 """
-from __future__ import annotations
-
 import math
 import time
 import logging
 import threading
 from collections import Counter
 from concurrent.futures import ThreadPoolExecutor
-from typing import Optional, Any
+from typing import Any
 
 import numpy as np
 from fastapi import APIRouter, HTTPException, Query
 
 from ..database import db
 from ..services.clustering_engine import (
-    FEATURE_KEYS, FEATURE_NAMES, FEATURE_NORMS, N_FEATURES,
+    FEATURE_NAMES,
     build_feature_vector, kmeans_pp, pca_2d, compute_hulls,
     name_cluster, risk_score_from_centroid, standardize,
     risk_to_gradient_color,