fix(routes): complete post-refactor dependency wiring cleanup

dashcaddy-api/routes/tailscale.js

@@ -152,7 +152,7 @@ module.exports = function({
       throw new ValidationError('subdomain is required');
     }
 
-    let content = await caddy.read();
+    const content = await caddy.read();
     const domain = buildDomain(subdomain);
 
     const blockRegex = new RegExp(`(${domain.replace('.', '\\.')}\\s*\\{[^}]*\\})`, 's');