Update global and API rate limits for improved performance

- Increased GlobalRateLimit from 500 to 2000 to better handle higher traffic.
- Raised APIRateLimit from 150 to 500 to enhance API responsiveness.

internal/security/constants.go

@@ -25,9 +25,9 @@ const (
 	HeavyDownloaderLimit     = rate.Limit(256 * KB) // 256KB/s
 
 	// Rate Limiting
-	GlobalRateLimit  = 500
+	GlobalRateLimit  = 2000
 	GlobalRateWindow = 1 * time.Minute
-	APIRateLimit     = 150
+	APIRateLimit     = 500
 	APIRateWindow    = 1 * time.Minute
 )