chore(deps): upgrade to React 19, react-dom 19, lucide-react v1, helmet v8 (v0.11.11 Beta)

- React + @types/react bumped to v19 (merged Dependabot PRs #22, #23, #25)
- react-dom + @types/react-dom aligned to v19 (PR #26 had conflicts; applied manually)
- lucide-react upgraded from 0.309 → 1.16 to satisfy React 19 peer deps (no API changes for our icon usage pattern)
- helmet upgraded 7 → 8; contentSecurityPolicy: false option unchanged
- jest + @types/jest bumped (dev-only, no runtime impact)
- TypeScript clean, Vite build passes, zero new errors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 A self-hosted, full-stack network management platform for MikroTik devices. Monitor, configure, and manage your entire MikroTik infrastructure — routers, switches, and wireless access points — from a single web interface.
 
-![Version](https://img.shields.io/badge/version-0.11.10_Beta-blue)
+![Version](https://img.shields.io/badge/version-0.11.11_Beta-blue)
 ![License](https://img.shields.io/badge/license-AGPLv3-blue)
 ![Docker](https://img.shields.io/badge/docker-compose-2496ED?logo=docker&logoColor=white)
 ![TypeScript](https://img.shields.io/badge/TypeScript-5.3-3178C6?logo=typescript&logoColor=white)