treewide(refactor): rename files to follow the same style

lib/controllers/init_complete.dart

@@ -0,0 +1,11 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
+
+class InitCompleteController extends Notifier<bool> {
+  @override
+  bool build() => false;
+  void complete() => state = true;
+
+  static final provider = NotifierProvider<InitCompleteController, bool>(
+    InitCompleteController.new,
+  );
+}