1. firestore_add_document
Add a document to a collection.
2. firestore_list_documents
List documents with filtering.
3. firestore_get_document
Get a specific document.
4. firestore_update_document
Update an existing document.
5. firestore_delete_document
Delete a document.
6. firestore_list_collections
List root collections.
7. firestore_query_collection_group
Query across subcollections.
8. storage_list_files
List files in a directory.
9. storage_get_file_info
Get file metadata and URL.
10. storage_upload
Upload file from content.
11. storage_upload_from_url
Upload file from URL.
12. auth_get_user
Get user by ID or email.