Add combined Dockerfile for single-container deployment

.dockerignore

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+node_modules
+.git
+.gitignore
+.remtools
+.vibecoder
+tasks.md
+*.log
+.env
+.env.local
+dist
+build
+__pycache__
+*.pyc
+.pytest_cache
+.ruff_cache

Dockerfile

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+# Combined Dockerfile for FastAPI backend + React frontend
+# Stage 1: Build frontend
+FROM node:18-alpine AS frontend-builder
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+# Stage 2: Build backend and serve both
+FROM python:3.11-slim
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy backend requirements and install
+COPY backend/requirements.txt ./backend/
+RUN pip install --no-cache-dir -r backend/requirements.txt
+
+# Copy backend code
+COPY backend/ ./backend/
+
+# Copy built frontend from builder stage
+COPY --from=frontend-builder /app/frontend/dist ./frontend/dist
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONDONTWRITEBYTECODE=1
+
+# Expose port
+EXPOSE 8000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8000/health || exit 1
+
+# Run FastAPI server with static file serving
+CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]