fix: use TIMEOUTS constants instead of magic numbers in health and services routes

- health.js: replace magic number 5000 with TIMEOUTS.HTTP_DEFAULT (twice)
- services.js: replace magic number 5000 with TIMEOUTS.HTTP_DEFAULT

Both files already import TIMEOUTS from constants but weren't using it.

dashcaddy-api/routes/services.js

@@ -113,7 +113,7 @@ module.exports = function({
       const headers = {};
       if (pylonConfig.key) headers['x-pylon-key'] = pylonConfig.key;
       const controller = new AbortController();
-      const timeout = setTimeout(() => controller.abort(), 5000);
+      const timeout = setTimeout(() => controller.abort(), TIMEOUTS.HTTP_DEFAULT);
       const response = await fetchT(probeUrl, { method: 'GET', signal: controller.signal, headers });
       clearTimeout(timeout);
       if (!response.ok) return null;