docs: add DOCKER_GUIDE.md and fix .env parsing; chore: update docker and script configurations

docker/Dockerfile.api

@@ -0,0 +1,23 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Copy requirements first (for better caching)
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY src/ ./src/
+COPY config/ ./config/
+COPY scripts/ ./scripts/
+
+# Set Python path
+ENV PYTHONPATH=/app
+
+# Expose API port
+EXPOSE 8000
+
+# Run the API server
+CMD ["uvicorn", "src.api.server:app", "--host", "0.0.0.0", "--port", "8000"]