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

src/api/index.js

@@ -34,7 +34,14 @@ api.interceptors.response.use(
 
 export const systemApi = {
     getStatus: () => api.get('/system/getStatus'),
-    getSoftwareInfo: () => api.get('/system/getSoftwareInfo')
+    getSoftwareInfo: () => api.get('/system/getSoftwareInfo'),
+    getSystemInfo: () => api.get('/system/info'),
+    getSettings: (key) => {
+        const url = key ? `/system/settings/get?key=${key}` : '/system/settings/get';
+        return api.get(url);
+    },
+    setSettings: (settings) => 
+        api.post('/system/settings/set', settings)
 };
 
 export const authApi = {
@@ -109,10 +116,6 @@ export const monitorApi = {
     getSystemStats: () => api.get('/monitor/stats')
 };
 
-export const systemInfoApi = {
-    getSystemInfo: () => api.get('/system/info')
-};
-
 export default api;
 
 export const TODO_API_NOTES = {