统一 Node 22 与后端安全运行基线（07-15-production-trust-closeout-cleanup）

server/src/index.js

@@ -1,7 +1,7 @@
 require("dotenv/config");
 
 const { getConfig } = require("./config");
-const { initTracing } = require("./observability/tracing");
+const { initTracing, shutdownTracing } = require("./observability/tracing");
 
 const config = getConfig();
 initTracing(config);
@@ -35,22 +35,37 @@ async function main() {
     }, timeoutMs);
     forceTimer.unref?.();
 
+    let exitCode = 0;
     try {
       await app.close();
-      app.log.info("Graceful shutdown completed");
-      process.exit(0);
     } catch (error) {
       app.log.error({ err: error }, "Graceful shutdown failed");
-      process.exit(1);
+      exitCode = 1;
     }
+
+    try {
+      await shutdownTracing();
+    } catch (error) {
+      app.log.error({ err: error }, "OTel shutdown failed");
+      exitCode = 1;
+    }
+
+    clearTimeout(forceTimer);
+    app.log.info({ exitCode }, "Graceful shutdown completed");
+    process.exit(exitCode);
   };
 
   process.on("SIGTERM", () => shutdown("SIGTERM"));
   process.on("SIGINT", () => shutdown("SIGINT"));
 }
 
-main().catch((err) => {
+main().catch(async (err) => {
   // eslint-disable-next-line no-console
   console.error(err);
+  try {
+    await shutdownTracing();
+  } catch {
+    // The startup error remains authoritative; shutdown is best effort here.
+  }
   process.exit(1);
 });