fix: resolve import errors and add missing api hooks

- Create constants.ts for RECORD_A_MEETING_URL
- Add api-types.ts for backward compatible type exports
- Update all imports from deleted api folder to new locations
- Add missing React Query hooks for rooms and zulip operations
- Create useApi compatibility layer for unmigrated components

www/app/page.tsx

@@ -1,6 +1,6 @@
 "use client";
 import { redirect } from "next/navigation";
-import { RECORD_A_MEETING_URL } from "./api/urls";
+import { RECORD_A_MEETING_URL } from "./lib/constants";
 
 export default function Index() {
   redirect(RECORD_A_MEETING_URL);