feat(csms): add system settings management for OCPP 1.6J heartbeat interval

apps/csms/drizzle/meta/_journal.json

@@ -43,6 +43,13 @@
       "when": 1773678571220,
       "tag": "0005_peaceful_anthem",
       "breakpoints": true
+    },
+    {
+      "idx": 6,
+      "version": "7",
+      "when": 1773682931777,
+      "tag": "0006_spooky_skin",
+      "breakpoints": true
     }
   ]
 }