feat(validation): make hostname validation case-insensitive and expand allowed characters

- Normalize hostnames to lowercase for RFC 1123 compliance while accepting uppercase input
- Expand NAME_PATTERN to allow parentheses, hash, comma, colon, and plus characters
- Add fallback to random name generation when application name doesn't meet minimum requirements
- Add comprehensive test coverage for validation patterns and edge cases

app/Rules/ValidHostname.php

@@ -62,12 +62,15 @@ class ValidHostname implements ValidationRule
                     // Ignore errors when facades are not available (e.g., in unit tests)
                 }
 
-                $fail('The :attribute contains invalid characters. Only lowercase letters (a-z), numbers (0-9), hyphens (-), and dots (.) are allowed.');
+                $fail('The :attribute contains invalid characters. Only letters (a-z, A-Z), numbers (0-9), hyphens (-), and dots (.) are allowed.');
 
                 return;
             }
         }
 
+        // Normalize to lowercase for validation (RFC 1123 hostnames are case-insensitive)
+        $hostname = strtolower($hostname);
+
         // Additional validation: hostname should not start or end with a dot
         if (str_starts_with($hostname, '.') || str_ends_with($hostname, '.')) {
             $fail('The :attribute cannot start or end with a dot.');
@@ -100,9 +103,9 @@ class ValidHostname implements ValidationRule
                 return;
             }
 
-            // Check if label contains only valid characters (lowercase letters, digits, hyphens)
+            // Check if label contains only valid characters (letters, digits, hyphens)
             if (! preg_match('/^[a-z0-9-]+$/', $label)) {
-                $fail('The :attribute contains invalid characters. Only lowercase letters (a-z), numbers (0-9), hyphens (-), and dots (.) are allowed.');
+                $fail('The :attribute contains invalid characters. Only letters (a-z, A-Z), numbers (0-9), hyphens (-), and dots (.) are allowed.');
 
                 return;
             }