(Update) Cast int announce query parameters to ints

[Roardom]

No description provided.

[what-the-diff]

PR Summary

• Improved Data Accuracy
  This PR includes important updates to our AnnounceController.php and ProcessAnnounce.php files to ensure more accurate data capture and processing. By adding type casting to (int) to several fields, we're making sure that the info we capture and use are numbers, avoiding potential errors or misinterpretations in our calculations.

• Strict Equality Comparisons
  We have made our code more precise by changing equality comparisons (==) to strict equality comparisons (===) in various places. This means we're not just comparing values, but the actual type of the information - ensuring that, for example, the string '5' is not considered the same as the number 5. This increases overall reliability.

• Improved User Download Verification
  Changes were made to enhance the checks over users' download permissions. With this modification, only users with explicit download rights will be able to initiate downloads thus providing better control.

These updates are part of our continuous efforts to improve the internals of our platform, making it more robust, more secure, and more reliable.