(core) Add basic activation page to grist-ee

Summary:
Adds an activation page to grist-ee that currently shows activation status.

Follow-up diffs will introduce additional functionality, such as the ability to
enter activation keys directly from the activation page.

Test Plan: No grist-ee tests (yet).

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: dsagal, paulfitz

Differential Revision: https://phab.getgrist.com/D3582

app/server/lib/sendAppPage.ts

@@ -54,7 +54,7 @@ export function makeGristConfig(homeUrl: string|null, extra: Partial<GristLoadCo
     enableWidgetRepository: Boolean(process.env.GRIST_WIDGET_LIST_URL),
     survey: Boolean(process.env.DOC_ID_NEW_USER_INFO),
     tagManagerId: process.env.GOOGLE_TAG_MANAGER_ID,
-    activation: (mreq as RequestWithLogin|undefined)?.activation,
+    activation: getActivation(req as RequestWithLogin | undefined),
     ...extra,
   };
 }
@@ -184,3 +184,11 @@ function getDocFromConfig(config: GristLoadConfig): Document | null {
 
   return config.getDoc[config.assignmentId] ?? null;
 }
+
+function getActivation(mreq: RequestWithLogin|undefined) {
+  const defaultEmail = process.env.GRIST_DEFAULT_EMAIL;
+  return {
+    ...mreq?.activation,
+    isManager: Boolean(defaultEmail && defaultEmail === mreq?.user?.loginEmail),
+  };
+}