feat: add autoAcceptPeering instance setting with drizzle migration

Adds `auto_accept_peering` integer column (default 1/true) to the
`instance_settings` singleton table, controlling whether this instance
auto-accepts incoming peering requests. Includes generated migration
`0001_clear_earthquake.sql` applied automatically on server boot.

packages/server/drizzle/meta/_journal.json

@@ -8,6 +8,13 @@
       "when": 1775687181033,
       "tag": "0000_initial",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "6",
+      "when": 1775734599940,
+      "tag": "0001_clear_earthquake",
+      "breakpoints": true
     }
   ]
 }