Implement dynamic request throttle configuration; update HttpClient initialization

.vscode/mcp.example.json

@@ -10,7 +10,8 @@
       ],
        "env": {
           "USERNAME": "mail@address.com",
-          "PASSWORD": "sup3rsecur3"
+         "PASSWORD": "sup3rsecur3",
+         "REQUEST_THROTTLE_MS": "500"
        }
     }
   }

FsMcp/FoodsharingApiClient.cs

@@ -4,9 +4,23 @@ namespace FsMcp;
 
 internal sealed class FoodsharingApiClient
 {
+    private const string RequestThrottleMsEnvVar = "REQUEST_THROTTLE_MS";
+    
     private readonly SemaphoreSlim _loginLock = new(1, 1);
 
-    public HttpClient HttpClient { get; } = new(new RequestThrottleHandler(TimeSpan.FromMilliseconds(200)));
+    public HttpClient HttpClient { get; } = new(new RequestThrottleHandler(TimeSpan.FromMilliseconds(GetRequestThrottleMs())));
+
+    private static int GetRequestThrottleMs()
+    {
+        string? configuredValue = Environment.GetEnvironmentVariable(RequestThrottleMsEnvVar);
+
+        if (int.TryParse(configuredValue, out int throttleMs) && throttleMs >= 0)
+        {
+            return throttleMs;
+        }
+
+        return 500;
+    }
 
     public async Task EnsureLoginAsync()
     {