refactor: 重构项目结构，将geo_tools重命名为app并更新相关引用

- 将主包名从geo_tools改为app
- 更新所有模块中的引用路径
- 迁移并更新测试用例
- 添加项目规则文档
- 保持原有功能不变，仅进行结构调整

tests/test_analysis.py

@@ -4,8 +4,8 @@ import pytest
 import geopandas as gpd
 from shapely.geometry import Point, Polygon
 
-from geo_tools.analysis.spatial_ops import overlay, select_by_location
-from geo_tools.analysis.stats import area_weighted_mean, count_by_polygon, summarize_attributes
+from app.analysis.spatial_ops import overlay, select_by_location
+from app.analysis.stats import area_weighted_mean, count_by_polygon, summarize_attributes
 
 
 class TestOverlay: