Keep the upstream project's name out of user-visible strings

The first-party application descriptions and the telemetry service name and
instrumentation scope are shown to operators, and the unpacked-application
temp directory carried the name too.

Left alone deliberately: the OAuth key-derivation contexts (renaming them
would invalidate every sealed token and client id), the migration defaults
that read an upstream installation, links to upstream's upgrade guide, the
wire-protocol identifiers, and upstream's own license and templates.

crates/common/src/manager/first_party.rs

@@ -298,7 +298,7 @@ mod tests {
 
     fn web_interface() -> Application {
         Application {
-            description: "Stalwart Web Interface".to_string(),
+            description: "INBUXA Web Interface".to_string(),
             enabled: true,
             url_prefix: Map::new(vec!["/admin".into(), "/account".into()]),
             ..Default::default()
@@ -312,7 +312,7 @@ mod tests {
             clients,
             vec![FirstPartyClient {
                 client_id: WEB_INTERFACE_CLIENT_ID.to_string(),
-                description: "Stalwart Web Interface (served by this server)".to_string(),
+                description: "INBUXA Web Interface (served by this server)".to_string(),
                 redirect_uris: vec![
                     "https://mail.example.org/admin/oauth/callback".to_string(),
                     "https://mail.example.org/account/oauth/callback".to_string(),