feat: host-centric network map, analysis dashboard, deduped inventory

- Rewrote NetworkMap to use deduplicated host inventory (163 hosts from 394K rows)
- New host_inventory.py service: scans datasets, groups by FQDN/ClientId, extracts IPs/users/OS
- New /api/network/host-inventory endpoint
- Added AnalysisDashboard with 6 tabs (IOC, anomaly, host profile, query, triage, reports)
- Added 16 analysis API endpoints with job queue and load balancer
- Added 4 AI/analysis ORM models (ProcessingJob, AnalysisResult, HostProfile, IOCEntry)
- Filters system accounts (DWM-*, UMFD-*, LOCAL/NETWORK SERVICE)
- Infers OS from hostname patterns (W10-* -> Windows 10)
- Canvas 2D force-directed graph with host/external-IP node types
- Click popover shows hostname, FQDN, IPs, OS, users, datasets, connections

frontend/nginx.conf

@@ -15,10 +15,10 @@ server {
         proxy_set_header   X-Real-IP         $remote_addr;
         proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
         proxy_set_header   X-Forwarded-Proto $scheme;
-        proxy_read_timeout 120s;
+        proxy_read_timeout 300s;
     }
 
-    # SPA fallback — serve index.html for all non-file routes
+    # SPA fallback  serve index.html for all non-file routes
     location / {
         try_files $uri $uri/ /index.html;
     }
@@ -28,4 +28,4 @@ server {
         expires 1y;
         add_header Cache-Control "public, immutable";
     }
-}
+}