feat(contact): Add hCaptcha integration, Discord alert for contact

- Added hCaptcha validation to the contact form.
- Integrated hCaptcha configuration in the application.
- Implemented Discord alerts for new contact submissions with detailed content.

app/Http/Requests/ContactSubmissionRequest.php

@@ -11,10 +11,11 @@ class ContactSubmissionRequest extends FormRequest
         return [
             'name'     => ['required', 'max:254'],
             'email'    => ['required', 'email', 'max:254'],
-            'discord'  => ['nullable', 'min:2', 'max:34'],
+            'discord'  => ['nullable', 'min:2', 'max:35'],
             'category' => ['required', 'in:question,advertising,bug_report,feedback,other'],
             'subject'  => ['required', 'max:254'],
             'message'  => ['required', 'unique:contact_submissions', 'max:3500'],
+            'h-captcha-response' => 'required|HCaptcha'
         ];
     }
 
@@ -22,4 +23,14 @@ class ContactSubmissionRequest extends FormRequest
     {
         return true;
     }
+
+    public function messages(): array
+    {
+        return [
+            'h-captcha-response.required' => 'Please verify that you are not a robot.',
+            'h-captcha-response.h_captcha' => 'Failed to validate captcha.',
+            'category.in' => 'Invalid category.',
+            'message.unique' => 'You have already submitted this message.',
+        ];
+    }
 }