feat: миграция frontend React 18 → Angular 19

Полная миграция фронтенда на Angular 19 + PrimeNG + NgRx SignalStore.

- React 18 + AntD 5 + Zustand + Vite → Angular 19 + PrimeNG 19 + NgRx SignalStore + Angular CLI
- Ноды X6: React-компоненты → чистые DOM-функции через Shape.HTML.register с effect: ['data']
- Все 5 типов нод (site, device, cross-device, splice, card) переписаны как рендереры
- Zustand store → NgRx signalStore (schema.store.ts)
- AntD компоненты → PrimeNG (p-tree, p-table, p-menu, p-toggleSwitch, p-slider, p-button)
- 13 файлов чистого TypeScript переиспользованы as-is (типы, константы, утилиты, мок, layout, ports, edges)
- Структура файлов переименована в kebab-case

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

frontend/.gitignore

@@ -1,24 +1,42 @@
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-lerna-debug.log*
+# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
 
-node_modules
-dist
-dist-ssr
-*.local
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
 
-# Editor directories and files
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
 .vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
 !.vscode/extensions.json
-.idea
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+
+# System files
 .DS_Store
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?
+Thumbs.db