refactor: reorganize project structure by moving core modules and update import paths in API server

.temp/cloud_removal_train.ipynb

@@ -0,0 +1,10 @@
+{
+ "cells": [],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}