feat: add project's user count (#6992)

* feat: add project user count

* feat: add user count

* fix: user count

src/api/project.ts

@@ -0,0 +1,15 @@
+import { type APIContext } from 'astro';
+import { api } from './api.ts';
+
+export function projectApi(context: APIContext) {
+  return {
+    listProjectsUserCount: async function (projectIds: string[]) {
+      return api(context).post<Record<string, number>>(
+        `${import.meta.env.PUBLIC_API_URL}/v1-list-projects-user-count`,
+        {
+          projectIds,
+        },
+      );
+    },
+  };
+}