[feature] list commands for both attachment and emojis (#2121)

* [feature] list commands for both attachment and emojis

* use fewer commands, provide `local-only` and `remote-only` as filters

* envparsing

---------

Co-authored-by: Romain de Laage <romain.delaage@rdelaage.ovh>
Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

test/envparsing.sh

@@ -87,6 +87,7 @@ EXPECT=$(cat << "EOF"
     "letsencrypt-email-address": "",
     "letsencrypt-enabled": true,
     "letsencrypt-port": 80,
+    "local-only": false,
     "log-client-ip": false,
     "log-db-queries": true,
     "log-level": "info",
@@ -116,6 +117,7 @@ EXPECT=$(cat << "EOF"
     "path": "",
     "port": 6969,
     "protocol": "http",
+    "remote-only": false,
     "request-id-header": "X-Trace-Id",
     "smtp-disclose-recipients": true,
     "smtp-from": "queen.rip.in.piss@terfisland.org",