Add full AARS system - Attendance & Accident Record System

- FastAPI backend with SQLite database
- React + TailwindCSS frontend
- JWT authentication
- Excel upload/download for attendance and accident records
- Shift roster management with S7a/S7b split
- Lateness/OT calculation based on shift times
- Roster info API endpoints
- Export API with token query parameter support
- Docker compose deployment

frontend/src/api.js

@@ -0,0 +1,32 @@
+import axios from 'axios'
+
+const api = axios.create({
+  baseURL: '',
+  timeout: 30000,
+})
+
+// Request interceptor to add auth token
+api.interceptors.request.use(
+  config => {
+    const token = localStorage.getItem('aars_token')
+    if (token) {
+      config.headers.Authorization = `Bearer ${token}`
+    }
+    return config
+  },
+  error => Promise.reject(error)
+)
+
+// Response interceptor for error handling
+api.interceptors.response.use(
+  response => response,
+  error => {
+    if (error.response?.status === 401) {
+      localStorage.removeItem('aars_token')
+      window.location.href = '/login'
+    }
+    return Promise.reject(error)
+  }
+)
+
+export default api