HAKAN'S REQUIREMENT - Refactor API base URL configuration structure

Replaced ApiBaseUrl and DataApiBaseUrl with BaseUrl, ApiDefaultUrl, and service-specific configuration sections (AuthService, UserManagerService, DbFirstService). Updated AppSettings and all code references to use the new structure. Revised logic for HTTP client base URL selection to prefer service-specific settings. Updated appsettings files and added an example configuration for clarity and maintainability.

DbFirst.BlazorWebApp/appsettings.json

@@ -1,11 +1,25 @@
 {
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
+"Logging": {
+  "LogLevel": {
+    "Default": "Information",
+    "Microsoft.AspNetCore": "Warning"
+  }
+},
+"ApiDefaultUrl": "https://localhost:7204/",
+"AuthService": {
+  "BaseUrl": null,
+  "Login": "auth/login",
+  "Logout": "auth/logout",
+  "Check": "auth/check"
+},
+  "UserManagerService": {
+    "BaseUrl": null,
+    "GetUserInfo": "user/info",
+    "UpdateUserInfo": "user/update"
   },
-  "ApiBaseUrl": "http://172.24.12.39:9090/",
-  "DataApiBaseUrl": "https://localhost:7204/",
-  "AllowedHosts": "*"
+  "DbFirstService": {
+    "BaseUrl": null,
+    "GetData": "dbfirst/data",
+    "UpdateData": "dbfirst/update"
+  }
 }