Add Flask backend and React frontend skeleton with Render deployment config

[echska]

Motivation

• Provide a minimal backend API and file-based storage to collect and serve device data for the parental control dashboard.
• Deliver a React-based frontend skeleton with UI components and a polling dashboard to visualize calls, messages, locations and notifications.
• Prepare deployment on Render with a render.yaml and a Dockerfile for the backend and static configuration for the frontend.

Description

• Add a Flask backend in parental-control-system/backend providing GET /health, POST /api/v1/sync, and GET /api/v1/data/<category> with simple JSON file storage in vault_*.json files and helper functions read_items, write_items, and save_data.
• Add a Dockerfile and requirements.txt for the backend and configure Gunicorn as the production entrypoint.
• Add a React frontend in parental-control-system/frontend including package.json, tailwind.config.js, services/api.js for fetchCategory and syncCategory, a Dashboard page, and multiple display components (CallsTable, MessagesTable, LocationsMap, LocationsTimeline, AlertsPanel, WhatsAppPanel, InstagramPanel, RouterMonitor) to render fetched data.
• Add render.yaml to define two Render services (parental-control-backend using Docker and parental-control-frontend as a static site) and enable pull request previews.

Testing

• No automated tests were added or executed as part of this change.
• Render preview configuration is included via render.yaml to enable automatic deployment previews for the services.

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