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.

apps/backend/src/lib/geoip.ts

@@ -3,6 +3,8 @@ type IpGeoInfo = {
   city: string;
   country: string;
   countryCode: string;
+  lat: number | null;
+  lon: number | null;
 };
 
 const cache = new Map<string, { data: IpGeoInfo; expiresAt: number }>();
@@ -24,7 +26,14 @@ function setCache(ip: string, info: IpGeoInfo): void {
 
 async function fetchGeoInfo(ip: string): Promise<IpGeoInfo | null> {
   if (ip === '127.0.0.1' || ip === '::1' || ip.startsWith('192.168.') || ip.startsWith('10.')) {
-    return { ip, city: 'Red local', country: 'Red local', countryCode: 'LOCAL' };
+    return {
+      ip,
+      city: 'Red local',
+      country: 'Red local',
+      countryCode: 'LOCAL',
+      lat: null,
+      lon: null,
+    };
   }
 
   const cached = getCached(ip);
@@ -32,7 +41,7 @@ async function fetchGeoInfo(ip: string): Promise<IpGeoInfo | null> {
 
   try {
     const response = await fetch(
-      `http://ip-api.com/json/${ip}?fields=status,country,countryCode,city,query`
+      `http://ip-api.com/json/${ip}?fields=status,country,countryCode,city,lat,lon,query`
     );
     if (!response.ok) return null;
 
@@ -44,6 +53,8 @@ async function fetchGeoInfo(ip: string): Promise<IpGeoInfo | null> {
       city: data.city || 'Desconocida',
       country: data.country || 'Desconocido',
       countryCode: data.countryCode || '',
+      lat: data.lat ?? null,
+      lon: data.lon ?? null,
     };
 
     setCache(ip, info);