feat: add geolocation fields to session and implement geo stats endpoint

- Added country, city, countryCode, latitude, and longitude fields to the Session model.
- Updated geoip service to fetch and store geolocation data based on user IP.
- Created a new admin endpoint to retrieve geolocation statistics, including user counts by country and city.
- Enhanced admin page to display geolocation statistics with expandable city details.
- Introduced caching for geolocation data to optimize performance.

packages/api-contract/src/index.ts

@@ -139,6 +139,9 @@ export {
   adminGlobalStatsSchema,
   adminPaymentStatusSchema,
   adminUserSessionSchema,
+  adminGeoCitySchema,
+  adminGeoCountrySchema,
+  adminGeoStatsSchema,
 } from './admin'
 export type {
   AdminComplexListItem,
@@ -150,4 +153,7 @@ export type {
   AdminGlobalStats,
   AdminPaymentStatus,
   AdminUserSession,
+  AdminGeoCity,
+  AdminGeoCountry,
+  AdminGeoStats,
 } from './admin'