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/constants.ts

@@ -0,0 +1,2 @@
+// Application-wide constants
+export const RECORD_A_MEETING_URL = "/transcripts/new" as const;