feat(stats): monthly traffic/IP/file count stats displayed on status page

database.py

@@ -119,3 +119,28 @@ def is_traffic_exceeded(ip, additional_bytes, direction='upload'):
     else:
         total += additional_bytes
     return total > DAILY_TRAFFIC_LIMIT
+
+def get_monthly_stats():
+    now = datetime.utcnow()
+    month_start = now.strftime('%Y-%m-01')
+    conn = get_db()
+    traffic_row = conn.execute(
+        'SELECT COALESCE(SUM(upload_bytes),0) AS up, COALESCE(SUM(download_bytes),0) AS down FROM ip_traffic WHERE date >= ?',
+        (month_start,)
+    ).fetchone()
+    ip_count = conn.execute(
+        'SELECT COUNT(DISTINCT ip) FROM ip_traffic WHERE date >= ?',
+        (month_start,)
+    ).fetchone()[0]
+    file_count = conn.execute(
+        'SELECT COUNT(*) FROM files WHERE created_at >= ?',
+        (month_start,)
+    ).fetchone()[0]
+    conn.close()
+    total = (traffic_row['up'] or 0) + (traffic_row['down'] or 0)
+    return {
+        'total_bytes': total,
+        'total_gb': round(total / (1024**3), 2),
+        'ip_count': ip_count,
+        'file_count': file_count,
+    }