fix: mergeIfMissing function:

Author: Arif Hoque

src/Phaseolies/Http/Request.php

@@ -599,6 +599,7 @@ public function all(): ?array
     public function merge(array $input): self
     {
         $this->request->replace(array_merge($this->request->all(), $input));
+        $this->input = [];
 
         return $this;
     }

src/Phaseolies/Support/Router.php

@@ -832,7 +832,7 @@ protected function matchesDomain(string $domain, $request): bool
                 $existing        = $request->getRouteParams();
                 $existing[$m[1]] = $hostMatch[1];
                 $request->setRouteParams($existing);
-                $request->merge([$m[1] => $hostMatch[1]]);
+                $request->mergeIfMissing([$m[1] => $hostMatch[1]]);
 
                 return true;
             }