v1.13.0: load secrets from OpenBao at boot via @simpleworkjs/bao-conf

bin/www now defers require('../app') until bao-conf.init({ path: 'proxy' })
resolves, so models + createOidcClient see the OpenBao-merged config (the
OIDC clientSecret is captured at require time). Authenticates to OpenBao
with a scoped VAULT_TOKEN (policy proxy), never the root token; fail-soft
to CONF_SECRETS if OpenBao is unreachable. config/proxy-secrets.js becomes
an operator-edit seed artifact (OpenBao authoritative). README gains a
Secrets section.

Co-Authored-By: Claude <noreply@anthropic.com>

nodejs/package.json

@@ -1,6 +1,6 @@
 {
   "name": "proxy-api",
-  "version": "1.9.0",
+  "version": "1.13.0",
   "author": [
     {
       "name": "William Mantly",
@@ -22,6 +22,7 @@
     "@fortawesome/fontawesome-free": "^7.3.0",
     "@popperjs/core": "^2.11.8",
     "@simpleworkjs/app-stack": "^1.0.0",
+    "@simpleworkjs/bao-conf": "^1.0.0",
     "@simpleworkjs/conf": "^1.2.0",
     "@simpleworkjs/frontend": "^0.2.7",
     "@simpleworkjs/ldap": "^1.0.0",