Add reusable GIS run mode and AI runtime opt-in

backend/Dockerfile

@@ -2,6 +2,8 @@ FROM python:3.12-slim
 
 WORKDIR /app
 
+ARG GEOINTEL_INSTALL_AI=false
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
     gdal-bin \
@@ -15,7 +17,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY pyproject.toml README.md /app/
 COPY app /app/app
 RUN pip install --no-cache-dir --upgrade pip setuptools
-RUN pip install --no-cache-dir ".[gis]"
+RUN extras=".[gis]" \
+    && if [ "$GEOINTEL_INSTALL_AI" = "true" ]; then extras=".[gis,ai]"; fi \
+    && pip install --no-cache-dir "$extras"
 
 COPY . /app
 RUN python scripts/gis_import_smoke.py