chore: regenerate api contract [CI]

contracts/api.schemas.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "x-backend-contract-sha256": "96cd0ffa3588a288af7bc720b2413cb56499dd862ac98d83c73ccc11a1147d25",
+  "x-backend-contract-sha256": "f4bc49429f3d1be87defcdfa3c94b61822eea9dfcfa6693241572edea1a8aefc",
   "$defs": {
     "AccountChannelBody": {
       "type": "object",
@@ -1036,6 +1036,9 @@
         "joined_at": {
           "type": "integer"
         },
+        "last_seen": {
+          "type": "integer"
+        },
         "online": {
           "type": "boolean"
         },
@@ -1052,6 +1055,7 @@
       "required": [
         "devices",
         "joined_at",
+        "last_seen",
         "online",
         "online_devices",
         "role",