Update log file naming convention in NLog config

The `logFileNamePrefix` variable in the `NLog` configuration was updated to use a period (`.`) instead of a hyphen (`-`) as the separator between the date and the application name.

Old format: `${shortdate}-Rec.API.Web`
New format: `${shortdate}.Rec.API`

This change aligns the log file naming convention with a new standard or improves consistency across file naming practices.

src/ReC.API/appsettings.json

@@ -19,7 +19,7 @@
     "throwConfigExceptions": true,
     "variables": {
       "logDirectory": "E:\\LogFiles\\Digital Data\\Rec.API",
-      "logFileNamePrefix": "${shortdate}-Rec.API.Web"
+      "logFileNamePrefix": "${shortdate}.Rec.API"
     },
     "targets": {
       "infoLogs": {