feat: synchronize access.log client IPs across nodes (#5098)

* feat: synchronize access.log client IPs across nodes for global fail2ban limits

* fix(nodes): harden cross-node client-IP merge for cluster fail2ban

MergeInboundClientIps inserted new rows with the remote node's primary key,
which collides with the independently auto-incremented local id and rolled
back the whole sync batch — breaking exactly the node-only clients the
feature targets. It also never evicted stale IPs, so the 30-minute cutoff
was defeated cluster-wide (the master pushed its unpruned table back to
nodes, which re-added IPs they had just pruned) and the blobs grew unbounded.

- drop the remote id on create (Id=0) and guard the email-unique race with
  ON CONFLICT DO NOTHING; also fixes a latent Postgres sequence collision
- apply the same 30-minute stale cutoff inside the merge and skip creating
  node-only rows whose IPs are all stale
- throttle the IP fetch/merge/push to ~10s (data only refreshes every 10s)
  instead of running on every 5s traffic tick, cutting SQLite write churn
- log the load error on the push path and tidy the merge response message
- add unit tests for the merge (remote-id, dedup, stale-drop, skips)

---------

Co-authored-by: Rqzbeh <Rqzbeh@example.com>
Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

frontend/src/pages/api-docs/endpoints.ts

@@ -442,6 +442,21 @@ export const sections: readonly Section[] = [
         body: 'sni=example.com',
         response: '{\n  "success": true,\n  "obj": {\n    "echKeySet": "...",\n    "echServerKeys": [...],\n    "echConfigList": "..."\n  }\n}',
       },
+      {
+        method: 'GET',
+        path: '/panel/api/server/clientIps',
+        summary: 'Fetch the fully aggregated inbound_client_ips database table. Used by nodes to sync recently active IPs across the cluster.',
+        responseSchema: 'InboundClientIps',
+        responseSchemaArray: true,
+      },
+      {
+        method: 'POST',
+        path: '/panel/api/server/clientIps',
+        summary: 'Submit a list of recently active IP timestamps. The panel merges them with the existing database to maintain a unified global IP-limit view.',
+        params: [
+          { name: 'ips', in: 'body (json)', type: 'object[]', desc: 'Array of InboundClientIps to merge.' },
+        ],
+      },
     ],
   },