chore(release): public-release readiness fixes for 1.1.18

- CHANGELOG.md now embeds full app-level release notes for submodule bumps.
- .env.example uses explicit CHANGE-ME placeholders instead of realistic-looking defaults.
- config.example comments describe the actual CONF_SECRETS mechanism.
- setup.sh summary no longer prints generated passwords to stdout.
- bootstrap.js fails hard instead of falling back to weak default passwords.

Note: submodule pins will be updated to v1.1.16 after the app PRs merge.

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

.env.example

@@ -14,7 +14,8 @@
 LDAP_BASE_DN=dc=example,dc=com
 # DNS domain (dc=foo,dc=bar -> foo.bar). Leave blank to derive from LDAP_BASE_DN.
 LDAP_DOMAIN=
-LDAP_ADMIN_PASS=change-me-ldap-admin-password
+# LDAP admin password. MUST be changed. Leave blank and setup.sh will generate one.
+LDAP_ADMIN_PASS=CHANGE-ME
 ORG_NAME="My Org"
 
 # ── Public hostnames (REQUIRED) ───────────────────────────────────────────────
@@ -30,13 +31,15 @@ PROXY_HOST=proxy.example.com
 # app_sso_oauth_admin, and logs in as them to register the proxy OAuth client.
 # Re-running setup.sh resets this password to BOOTSTRAP_ADMIN_PASS.
 BOOTSTRAP_ADMIN_UID=admin
-BOOTSTRAP_ADMIN_PASS=change-me-admin-password
+# First admin password. MUST be changed. Leave blank and setup.sh will generate one.
+BOOTSTRAP_ADMIN_PASS=CHANGE-ME
 BOOTSTRAP_ADMIN_EMAIL=admin@example.com
 
 # ── Proxy LDAP service account (created by the bootstrap) ────────────────────
 # The proxy binds to LDAP as cn=ldapclient,ou=people,<base> with this password.
 # Re-running setup.sh resets it to LDAP_SERVICE_PASS.
-LDAP_SERVICE_PASS=change-me-ldap-service-password
+# LDAP service-account password. MUST be changed. Leave blank and setup.sh will generate one.
+LDAP_SERVICE_PASS=CHANGE-ME
 
 # ── OAuth JWT secret (REQUIRED — persist it) ────────────────────────────────
 # Signs the SSO's access/refresh tokens. Generate with: openssl rand -hex 32