fix(api): add timeouts for OIDC discovery fetch and DB connection

- OIDC discovery fetch in initAuth() now has a 5s AbortSignal.timeout
  to fail fast instead of hanging indefinitely when the auth server is unreachable.
  This was identified as a root cause of startup ECONNRESET crashes on UAT
  where ztunnel drops TCP connections before headers arrive.

- DB postgres client now sets connect_timeout: 5 so failed connection attempts
  fail fast rather than hanging the startup sequence.

- Graceful shutdown timeout tightened to 8s (from 10s) to avoid
  getting killed by Kubernetes liveness-probe deadline while draining.

Fixes GRO-1678.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/src/index.ts

@@ -12,7 +12,7 @@ export function getDb() {
   if (_db) return _db;
   const url = process.env.DATABASE_URL;
   if (!url) throw new Error("DATABASE_URL is not set");
-  const client = postgres(url, { max: 10 });
+  const client = postgres(url, { max: 10, connect_timeout: 5 });
   _db = drizzle(client, { schema });
   return _db;
 }