feat(settings): add settings page with server, watchdog and notification config

- Add new Settings view with form controls for server, watchdog and notification settings
- Implement API endpoints for getting and saving settings
- Add settings route and sidebar navigation item
- Update button styles to include text color variable
- Change default app target to local development address

vite.config.js

@@ -1,7 +1,7 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 
-const APP_TARGET = '10.0.64.19:8080'
+const APP_TARGET = '192.168.20.4:19090'
 
 export default defineConfig({
     define: {