config(api): exclude own IP from popularity page-view tracking

Adds 83.135.64.30 to popularity.exclude_ips so local/manual testing
against prod doesn't inflate real-visitor page-view stats. IP is
dynamic — a stopgap; smoke tests should target the test instance.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Np4cMQLF77i664CAQXySzU

config/plugins/api.yaml

@@ -49,7 +49,8 @@ invitations:
 popularity:
   enabled: true
   exclude_admin: true
-  exclude_ips: {  }
+  exclude_ips:
+    - 83.135.64.30
   history:
     daily: 30
     monthly: 12