feat: implement Settings, Security, and Backups routes with API integration

frontend/src/api/user.ts

@@ -0,0 +1,19 @@
+import client from './client'
+
+export interface UserProfile {
+  id: number
+  email: string
+  name: string
+  role: string
+  api_key: string
+}
+
+export const getProfile = async (): Promise<UserProfile> => {
+  const response = await client.get('/user/profile')
+  return response.data
+}
+
+export const regenerateApiKey = async (): Promise<{ api_key: string }> => {
+  const response = await client.post('/user/api-key')
+  return response.data
+}