feat: localization service and frontend integration

- Add localization-service microservice (locale resolution, translations)
- Add frontend API routes /api/locale and /api/translations/[locale]
- Add LocalizationProvider and localization context
- Integrate localization into layout, EmptyChat, MessageInput components
- Update MICROSERVICES.md architecture docs
- Add localization-service to workspaces

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -16,7 +16,8 @@
     "docker:build": "docker build -f docker/Dockerfile -t gooseek:latest .",
     "docker:up": "docker compose -f docker/docker-compose.yaml up -d",
     "docker:down": "docker compose -f docker/docker-compose.yaml down",
-    "dev:geo": "npm run dev -w geo-device-service"
+    "dev:geo": "npm run dev -w geo-device-service",
+    "dev:locale": "npm run dev -w localization-service"
   },
   "devDependencies": {
     "prettier": "^3.2.5"