fix: use lean server requirements in Dockerfile (exclude unsloth/torch)

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3.11-slim
 WORKDIR /app
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+COPY requirements-server.txt .
+RUN pip install --no-cache-dir -r requirements-server.txt
 COPY . .
 RUN python -c "from data.loader import build_fact_database; build_fact_database()" || true
 EXPOSE 7860

requirements-server.txt

@@ -0,0 +1,8 @@
+openenv-core==0.2.3
+fastapi>=0.104.0
+uvicorn>=0.24.0
+pydantic>=2.0.0
+datasets>=2.0.0
+faker>=18.0.0
+python-dotenv>=1.0.0
+websockets>=15.0.0