feat: replace /healthz + /readyz with single /health (real S3 check)

server.js

@@ -85,31 +85,25 @@ async function docsHandler(req, res) {
   res.end('Documentation file not found');
 }
 
-async function readyz(_req, res) {
+async function health(_req, res) {
   if (!S3_BUCKET) {
-    res.statusCode = 200;
-    res.end(JSON.stringify({ status: 'ready', s3: 'not configured' }));
+    res.statusCode = 503;
+    res.end('s3 unreachable: S3_BUCKET not configured');
     return;
   }
   try {
     await s3.send(new HeadBucketCommand({ Bucket: S3_BUCKET }));
     res.statusCode = 200;
-    res.end(JSON.stringify({ status: 'ready', s3: 'ok' }));
-  } catch (_error) {
+    res.end('ok');
+  } catch (error) {
     res.statusCode = 503;
-    res.end(JSON.stringify({ status: 'not ready', s3: 'unavailable' }));
+    res.end('s3 unreachable: ' + (error && error.message ? error.message : error));
   }
 }
 
 const server = http.createServer((req, res) => {
-  if (req.url === '/healthz') {
-    res.statusCode = 200;
-    res.setHeader('Content-Type', 'application/json');
-    res.end(JSON.stringify({ status: 'ok', version: VERSION }));
-    return;
-  }
-  if (req.url === '/readyz') {
-    readyz(req, res);
+  if (req.url === '/health') {
+    health(req, res);
     return;
   }
   if (req.url.startsWith('/docs/')) {