Update Dockerfile and API requirements for improved build and dependencies

- Add Rust installation to Dockerfile for potential performance improvements
- Set explicit Docker data directories
- Add graspologic library to API requirements
- Optimize Docker build stages and environment setup

Dockerfile

@@ -1,13 +1,23 @@
 # Build stage
-FROM python:3.11-slim as builder
+FROM python:3.11-slim AS builder
 
 WORKDIR /app
 
+# Install Rust and required build dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    build-essential \
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/* \
+    && curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && . $HOME/.cargo/env
+
 # Copy only requirements files first to leverage Docker cache
 COPY requirements.txt .
 COPY lightrag/api/requirements.txt ./lightrag/api/
 
 # Install dependencies
+ENV PATH="/root/.cargo/bin:${PATH}"
 RUN pip install --user --no-cache-dir -r requirements.txt
 RUN pip install --user --no-cache-dir -r lightrag/api/requirements.txt
 
@@ -28,6 +38,10 @@ ENV PATH=/root/.local/bin:$PATH
 # Create necessary directories
 RUN mkdir -p /app/data/rag_storage /app/data/inputs
 
+# Docker data directories
+ENV WORKING_DIR=/app/data/rag_storage
+ENV INPUT_DIR=/app/data/inputs
+
 # Expose the default port
 EXPOSE 9621