fix dockerfile

Dockerfile

@@ -1,15 +1,18 @@
-FROM python:3.11-slim        # base image to start from
+FROM python:3.11-slim
 
-RUN apt-get install -y git   # run a shell command
+RUN apt-get update && apt-get install -y \
+    libspatialindex-dev \
+    gcc \
+    g++ \
+    && rm -rf /var/lib/apt/lists/*
 
-WORKDIR /app                 # set working directory
+WORKDIR /app
 
-COPY requirements.txt .      # copy file from your computer → container
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
 
-RUN pip install -r requirements.txt
+COPY . .
 
-COPY . .                     # copy everything else
+EXPOSE 7860
 
-EXPOSE 7860                  # open this port
-
-CMD ["uvicorn", "main:app"]  # command to run when container starts
+CMD ["uvicorn", "backend.api.server:app", "--host", "0.0.0.0", "--port", "7860"]