Add dashboard activity leaderboards

docs/api.md

@@ -33,6 +33,10 @@ Query parameters:
   - optional
   - default: `50`
   - maximum: `1000`
+- `hours`
+  - optional
+  - default: `24`
+  - used for the top activity leaderboards returned in the same payload
 
 Main response fields:
 
@@ -42,6 +46,11 @@ Main response fields:
 - `review_ips`
 - `allowed_ips`
 - `observed_ips`
+- `activity_since`
+- `top_ips_by_events`
+- `top_ips_by_traffic`
+- `top_sources`
+- `top_urls`
 - `recent_ips`
 - `recent_events`