feat: predefined server variables (COOLIFY_SERVER_NAME, COOLIFY_SERVER_UUID)

These are not visible on shared env page but user can use these variables like they use the COOLIFY_RESOURCE_UUID

app/Models/Environment.php

@@ -56,7 +56,7 @@ class Environment extends BaseModel
 
     public function environment_variables()
     {
-        return $this->hasMany(SharedEnvironmentVariable::class);
+        return $this->hasMany(SharedEnvironmentVariable::class)->where('type', 'environment');
     }
 
     public function applications()