Refactor config retrieval and update appsettings.json

Simplified the retrieval of the `TopClientTypes` configuration value in `ReportController.cs` by using `int.Parse(configuration["TopClientTypes"]!)` instead of `configuration.GetSection("AppSettings:TopClientTypes").Get<int>()`.

Restructured `appsettings.json` to move `TopClientTypes` and `DefaultRedirectionUrl` settings out of the `AppSettings` section and place them directly at the root level, aligning with the updated code in `ReportController.cs`.

src/API/Controllers/ReportController.cs

@@ -40,7 +40,7 @@ public async Task<IActionResult> MostRequestedLinks(DateRangeRequest request)
     public async Task<IActionResult> ClientType(DateRangeRequest request)
     {
         var types = await mediator.Send(new GetClientTypeCountsQuery(request,
-            configuration.GetSection("AppSettings:TopClientTypes").Get<int>()));
+            int.Parse(configuration["TopClientTypes"]!)));
         return Ok(types);
     }
 

src/API/appsettings.json

@@ -27,10 +27,8 @@
     "13.86.153.189",
     "40.80.156.205"
   ],
-  "AppSettings": {
-    "DefaultRedirectionUrl": "https://edi.wang",
-    "TopClientTypes": 5
-  },
+  "DefaultRedirectionUrl": "https://edi.wang",
+  "TopClientTypes": 5,
   "FeatureManagement": {
     "AllowSelfRedirection": false,
     "EnableTracking": true