docs(i18n): add dashboard localization guide and links

ui/README.md

@@ -1,73 +1,62 @@
-# React + TypeScript + Vite
+# CCS Dashboard UI
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+React + TypeScript + Vite frontend for the CCS local dashboard.
 
-Currently, two official plugins are available:
+This UI is served by the CCS web server and is accessed via:
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) (or [oxc](https://oxc.rs) when used in [rolldown-vite](https://vite.dev/guide/rolldown)) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
-
-## React Compiler
-
-The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
-
-```js
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-
-      // Remove tseslint.configs.recommended and replace with this
-      tseslint.configs.recommendedTypeChecked,
-      // Alternatively, use this for stricter rules
-      tseslint.configs.strictTypeChecked,
-      // Optionally, add this for stylistic rules
-      tseslint.configs.stylisticTypeChecked,
-
-      // Other configs...
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
+```bash
+ccs config
 ```
 
-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+---
 
-```js
-// eslint.config.js
-import reactX from 'eslint-plugin-react-x'
-import reactDom from 'eslint-plugin-react-dom'
+## Development
 
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-      // Enable lint rules for React
-      reactX.configs['recommended-typescript'],
-      // Enable lint rules for React DOM
-      reactDom.configs.recommended,
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
+From project root:
+
+```bash
+bun run dev
 ```
+
+This starts the CCS server and serves the dashboard at `http://localhost:3000`.
+
+From `ui/` only (frontend dev server):
+
+```bash
+cd ui
+bun run dev
+```
+
+---
+
+## Quality Commands
+
+```bash
+cd ui
+bun run typecheck
+bun run lint
+bun run validate
+bun run test:run
+```
+
+---
+
+## i18n
+
+Dashboard localization uses `react-i18next`.
+
+- Main setup: `ui/src/lib/i18n.ts`
+- Locale helpers: `ui/src/lib/locales.ts`
+- Language switcher: `ui/src/components/layout/language-switcher.tsx`
+
+For full architecture, conventions, and locale onboarding, see:
+
+- [`../docs/i18n-dashboard.md`](../docs/i18n-dashboard.md)
+
+---
+
+## Notes
+
+- UI locale persistence uses browser localStorage key `ccs-ui-locale`.
+- Current supported locales are managed in `ui/src/lib/locales.ts`.
+- Fallback locale is English (`en`).