Environment verification note

I scanned every Python file in the backend and compared the third-party imports with backend/environment.yml.

The backend imports these third-party packages:
- flask
- numpy
- PIL, installed as pillow
- rasterio
- requests
- shapely

The updated backend/environment.yml includes all of them from conda-forge.

It intentionally does not list Python standard-library modules such as json, csv, pathlib, math, hashlib, shutil, typing, base64, or re. It also does not list internal project modules such as routes, services, renderers, layers, utils, config, or cache.

Recommended setup command from the project root:

conda env create -f backend/environment.yml
conda activate wrapgis
python backend/app.py
