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/lib/useApi.ts

@@ -0,0 +1,13 @@
+// Compatibility layer for direct API client usage
+// Prefer using React Query hooks from api-hooks.ts instead
+
+import { client } from "./apiClient";
+
+// Returns the configured client for direct API calls
+// This is a minimal compatibility layer for components that haven't been fully migrated
+export default function useApi() {
+  return client;
+}
+
+// Export the client directly for non-hook contexts
+export { client };