chore: add Docker configuration for HuggingFace Spaces

.dockerignore

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+.git
+.gitignore
+*.md
+docs/
+.env
+.env.local
+__pycache__
+*.pyc
+.pytest_cache
+.ruff_cache
+node_modules
+.vite
+dist
+*.log

.env.example

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+# LLM Providers (optional - app works without them)
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+GOOGLE_API_KEY=
+GROQ_API_KEY=
+
+# HuggingFace
+HF_TOKEN=
+
+# App Settings
+DEBUG=false
+LOG_LEVEL=INFO

Dockerfile

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+# Stage 1: Build frontend
+FROM node:20-alpine AS frontend-builder
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+# Stage 2: Python runtime
+FROM python:3.11-slim
+WORKDIR /app
+
+# Install system deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python deps
+COPY backend/requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy backend
+COPY backend/app ./app
+
+# Copy frontend build
+COPY --from=frontend-builder /app/frontend/dist ./static
+
+# Expose port (HF Spaces uses 7860)
+EXPOSE 7860
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:7860/health || exit 1
+
+# Run
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]

docker-compose.yml

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+version: '3.8'
+services:
+  app:
+    build: .
+    ports:
+      - "7860:7860"
+    environment:
+      - DEBUG=true
+      - LOG_LEVEL=DEBUG
+    volumes:
+      - ./backend/app:/app/app
+    env_file:
+      - .env