feat: add React frontend with Vite alongside Angular}
- Add complete React UI with MUI components, Zustand stores, and React Router for all pages (database, console, monitoring, settings, search, info) - Add Vite build configuration and React entry point (main.tsx, App.tsx) - Add reusable React components: P3xrButton, P3xrAccordion, P3xrDialog, ConfirmDialog, PromptDialog, Toast, Overlay - Add React dialog components: ConnectionDialog, JsonEditorDialog, KeyNewOrSetDialog, TtlDialog, AiSettingsDialog, TreeSettingsDialog, KeyImportDialog, JsonViewDialog - Add React stores: socket service, redis state, settings, theme, navigation, overlay, monitoring data, i18n, common, main command - Add utility modules: tree builder, redis parser, shortcuts, electron bridge - Add key type components: KeyString, KeyHash, KeyList, KeySet, KeyZset, KeyStream, KeyTimeseries, KeyJson with shared base - Add monitoring pages: PulsePage, ProfilerPage, PubSubPage, MemoryAnalysisPage, MonitoringShell - Add i18n string files for 50+ locales - Remove deprecated Angular components: p3xr-error, p3xr-responsive-button, date pipe - Update Gruntfile to support dual Angular/React build pipeline - Update webpack config and package.json with React/Vite dependencies - Simplify Angular monitoring and settings components - Update Angular Material theme styles