fix: add shutdown timeout and improve health endpoint

- Add 8s shutdown timeout to prevent indefinite hang when app.close()
  stalls. Stays under Docker's default 10s stop_grace_period.
- Health endpoint now checks database connectivity, returns 503 when
  DB is unreachable so Docker marks container unhealthy.
- Removed variant field from health response (single image now).

apps/api/src/index.ts

@@ -108,12 +108,23 @@ await teamsRoutes(app);
 // API docs (Scalar)
 await docsRoutes(app);
 
-// Public health check (minimal - no internal details)
-app.get("/api/v1/health", async () => ({
-  status: "healthy",
-  version: APP_VERSION,
-  variant: process.env.STIRLING_VARIANT === "lite" ? "lite" : "full",
-}));
+// Public health check (checks core dependencies)
+app.get("/api/v1/health", async (_request, reply) => {
+  let dbOk = false;
+  try {
+    db.select().from(schema.settings).limit(1).all();
+    dbOk = true;
+  } catch {
+    /* db unreachable */
+  }
+
+  const status = dbOk ? "healthy" : "unhealthy";
+  const code = dbOk ? 200 : 503;
+  return reply.code(code).send({
+    status,
+    version: APP_VERSION,
+  });
+});
 
 // Admin health check (full diagnostics)
 app.get("/api/v1/admin/health", async (request, reply) => {
@@ -161,12 +172,19 @@ try {
 }
 
 // Graceful shutdown
+const SHUTDOWN_TIMEOUT_MS = 8000;
 let shuttingDown = false;
 async function shutdown(signal: string) {
   if (shuttingDown) return;
   shuttingDown = true;
   console.log(`\n${signal} received, shutting down gracefully...`);
 
+  const forceExit = setTimeout(() => {
+    console.error("Shutdown timed out, forcing exit");
+    process.exit(1);
+  }, SHUTDOWN_TIMEOUT_MS);
+  forceExit.unref();
+
   cleanupCron.stop();
 
   try {
@@ -199,6 +217,7 @@ async function shutdown(signal: string) {
     console.error("Error closing database:", err);
   }
 
+  clearTimeout(forceExit);
   process.exit(0);
 }