docs: update documentation and add Docker configuration for v0.3.0

- Update README.md with v0.3.0 completion status and improved setup instructions
- Update export/progress.md with completed tasks (53/55, 96% progress)
- Update export/architecture.md with current project structure and implementation status
- Add docker-compose.yml with PostgreSQL service
- Add Dockerfile.backend for production builds
- Add frontend/Dockerfile for multi-stage builds
- Update .gitignore with comprehensive rules for Python, Node.js, and Docker

Project status:
- v0.2.0: Database and Backend API ✅
- v0.3.0: Frontend React implementation ✅
- v0.4.0: Reports and visualization (planned)

frontend/Dockerfile

@@ -0,0 +1,31 @@
+# Dockerfile.frontend
+# Frontend React production image
+
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build application
+RUN npm run build
+
+# Production stage with nginx
+FROM nginx:alpine
+
+# Copy built assets
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy nginx config (optional)
+# COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]