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

scripts/training/train_land_decision_tree_gpu.py

@@ -0,0 +1,26 @@
+from train_module import train_model
+
+def main():
+    print("🚀 BẮT ĐẦU HUẤN LUYỆN MÔ HÌNH DECISION TREE (GPU & CACHE)")
+    
+    params = {
+        'bbox': [105.5, 9.2, 106.3, 10.0],
+        'time_range': '2023-01-01/2023-04-30',
+        'model_type': 'decision_tree',
+        'feature_mode': 'extended',
+        'use_cache': True,
+        'use_gpu': True,
+        'output_model_path': 'land_classification_model/model_decision_tree_auto.joblib', 'max_depth': 12
+    }
+    
+    try:
+        res = train_model(**params)
+        if res.get('success'):
+            print(f"✅ Hoàn thành! Accuracy: {res.get('test_accuracy', 0.0):.4f}")
+        else:
+            print(f"❌ Thất bại: {res.get('error', 'Unknown')}")
+    except Exception as e:
+        print(f"❌ Lỗi: {e}")
+
+if __name__ == "__main__":
+    main()