chore: add Docker setup and dependency pins

Dockerfile.backend

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y gcc g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY ./app /app/app
+
+RUN python -c "from langchain_community.embeddings import FastEmbedEmbeddings; FastEmbedEmbeddings(model_name='BAAI/bge-small-en-v1.5')"
+RUN python -c "from langchain_community.cross_encoders import HuggingFaceCrossEncoder; HuggingFaceCrossEncoder(model_name='BAAI/bge-reranker-base')"
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

Dockerfile.frontend

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN pip install --no-cache-dir streamlit requests
+
+COPY ./ui /app/ui
+
+EXPOSE 8501
+
+CMD ["streamlit", "run", "ui/app.py", "--server.port=8501", "--server.address=0.0.0.0"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  qdrant:
+    image: qdrant/qdrant:latest
+    ports:
+      - "6333:6333"
+    volumes:
+      - qdrant_storage:/qdrant/storage
+    restart: always
+
+  ollama:
+    image: ollama/ollama:latest
+    ports:
+      - "11434:11434"
+    volumes:
+      - ollama_storage:/root/.ollama
+    restart: always
+
+  backend:
+    build: 
+      context: .
+      dockerfile: Dockerfile.backend
+    ports:
+      - "8000:8000"
+    environment:
+      - QDRANT_URL=http://qdrant:6333
+      - OLLAMA_BASE_URL=http://ollama:11434
+    depends_on:
+      - qdrant
+      - ollama
+    restart: always
+
+  frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile.frontend
+    ports:
+      - "8501:8501"
+    environment:
+      - BACKEND_URL=http://backend:8000/chat/stream
+    depends_on:
+      - backend
+    restart: always
+
+volumes:
+  qdrant_storage:
+  ollama_storage:

requirements.txt

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+fastapi==0.110.0
+uvicorn==0.27.1
+pydantic-settings==2.2.1
+langchain==0.2.17
+langchain-community==0.2.19
+langchain-core==0.2.43
+langchain-text-splitters==0.2.4
+langchain-ollama==0.1.3
+langchain-qdrant==0.1.4
+qdrant-client==1.10.1
+fastembed==0.3.6
+sentence-transformers==2.5.1
+langgraph==0.2.76
+guardrails-ai==0.5.0
+ragas==0.1.21
+datasets==2.18.0
+pandas==2.2.1
+jinja2==3.1.3
+tabulate==0.9.0
+streamlit==1.32.2
+requests==2.34.2