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-lock.json

@@ -12,6 +12,7 @@
         "@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",
@@ -297,6 +298,18 @@
         "node": ">=18.0.0"
       }
     },
+    "node_modules/@simpleworkjs/bao-conf": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@simpleworkjs/bao-conf/-/bao-conf-1.0.0.tgz",
+      "integrity": "sha512-HxB2ohFuDKbwTfNh5dXCot0dd6qoP+3Ebz1xKH0eOhKNVNMjHU1p7XZv2VTe+VnHn+DV22Eh8lAgWxnX/pkXUw==",
+      "license": "MIT",
+      "dependencies": {
+        "extend": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/@simpleworkjs/conf": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@simpleworkjs/conf/-/conf-1.2.0.tgz",