Add Flask backend and React frontend skeleton for parental control dashboard

[echska]

Motivation

• Introduce an initial MVP for a unified parental control system consisting of a lightweight ingestion backend and a browser dashboard to visualize calls, messages, locations, and notifications.
• Provide a simple file-backed storage mechanism so ingested data can be persisted locally as JSON vault files for development and demos.
• Prepare application for simple deployment by adding a render.yaml service definition.

Description

• Add a Flask backend (parental-control-system/backend/main.py) exposing a health check and API endpoints POST /api/v1/sync for ingesting payloads and GET /api/v1/data/<category> for reading stored items, using local JSON files under the backend directory for storage.
• Create initial vault files (vault_calls.json, vault_messages.json, vault_locations.json, vault_notifications.json) and add helpers ensure_storage_files, read_items, and write_items to manage them.
• Scaffold a React frontend (parental-control-system/frontend) with package.json, tailwind.config.js, src/pages/Dashboard.js, and multiple UI components including CallsTable, MessagesTable, LocationsMap (using leaflet), LocationsTimeline, AlertsPanel, and placeholder panels for WhatsApp, Instagram, and RouterMonitor.
• Add a small API client src/services/api.js with fetchCategory to query the backend, and a deployment descriptor render.yaml to run the backend as a web service.

Testing

• No automated tests were executed for these changes.

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