feat: add centralized error logging system

- Implemented Error Log API to capture and store error logs from various services.
- Updated admin_ui to include Error Log Viewer component for inspecting logs.
- Enhanced error handling in auth_api, employee_api, and transit_api to report errors to the Error Log API.
- Modified existing services to utilize the new error logging functionality.
- Updated Docker Compose configuration to include the Error Log API service.
- Added error logging service in bus_terminal for Flutter application.

admin_ui/src/api.js

@@ -14,9 +14,38 @@ const normalizeApiBaseUrl = (value, fallbackPath) => {
 
 const AUTH_API = normalizeApiBaseUrl(RUNTIME.AUTH_API || import.meta.env.VITE_AUTH_API, 'http://localhost:5000')
 const TRANSIT_API = normalizeApiBaseUrl(RUNTIME.TRANSIT_API || import.meta.env.VITE_TRANSIT_API, 'http://localhost:5001')
+const ERROR_LOG_API = normalizeApiBaseUrl(RUNTIME.ERROR_LOG_API || import.meta.env.VITE_ERROR_LOG_API, 'http://localhost:5003')
+
+const reportClientError = async ({ service, partOfService, error }) => {
+  try {
+    await fetch(`${ERROR_LOG_API}/error_log`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        service,
+        partOfService,
+        error: typeof error === 'string' ? error : JSON.stringify(error),
+      }),
+    })
+  } catch (e) {
+    // ignore logging failures
+  }
+}
 
 export const authClient = axios.create({ baseURL: AUTH_API })
 
+authClient.interceptors.response.use(
+  response => response,
+  error => {
+    void reportClientError({
+      service: 'admin_ui',
+      partOfService: 'authClient',
+      error: error?.response?.data?.error || error?.message || 'authClient_error',
+    })
+    return Promise.reject(error)
+  }
+)
+
 export const transitClient = (token) => {
   const client = axios.create({
     baseURL: TRANSIT_API,
@@ -35,6 +64,11 @@ export const transitClient = (token) => {
           // reload to let App show the Login screen
           if (typeof window !== 'undefined') window.location.reload()
         }
+        void reportClientError({
+          service: 'admin_ui',
+          partOfService: 'transitClient',
+          error: error?.response?.data?.error || error?.message || 'transitClient_error',
+        })
       } catch (e) {
         // ignore
       }
@@ -44,3 +78,10 @@ export const transitClient = (token) => {
 
   return client
 }
+
+export const errorLogClient = (token) => axios.create({
+  baseURL: ERROR_LOG_API,
+  headers: token ? { Authorization: `Bearer ${token}` } : {},
+})
+
+export { reportClientError }