v1.30.0: rename theta-env -> theta-suite + docs rewrite + sso v1.16.1 (#126)

Rename the project to theta-suite (it is now an integrated suite of four
apps around a shared OpenBao secrets store, not a two-project env).
- theta-env -> theta-suite across the superproject: _config.yml (title +
  baseurl /theta-suite + repo URLs), README, setup.sh (incl. the
  THETA_SUITE_REEXECED self-update sentinel), docker-compose.yml,
  bootstrap.js, lint.yml, config.example/*, docs/robots.txt, all docs,
  this changelog.
- architecture.md rewritten: real 4-service + ldap-client topology, OpenBao
  secrets section, OpenBao-aware config flow; removed "two containers" /
  "three repos" / LDAP-"legacy" framing.
- index.md: integrated-suite framing + secrets/OpenBao + ldap-client.
- standalone.md + README: standalone reframed as advanced opt-in.
- sso-manager-node submodule -> v1.16.1 (401 fix on /conf and /vault).

Co-authored-by: Claude <noreply@anthropic.com>

config.example/proxy-secrets.js.example

@@ -1,5 +1,5 @@
 'use strict';
-// Example proxy secrets for the theta-env unified stack. Copy to
+// Example proxy secrets for the theta-suite unified stack. Copy to
 // ./config/proxy-secrets.js (NOT this file — ./config/ is gitignored) and edit.
 // `./setup.sh` generates ./config/proxy-secrets.js for you on first run and the
 // bootstrap writes the OAuth client clientId/clientSecret back into it; this

config.example/sso-secrets.js.example

@@ -1,5 +1,5 @@
 'use strict';
-// Example SSO secrets for the theta-env unified stack. Copy to
+// Example SSO secrets for the theta-suite unified stack. Copy to
 // ./config/sso-secrets.js (NOT this file — ./config/ is gitignored) and edit.
 // `./setup.sh` generates ./config/sso-secrets.js for you on first run; this file
 // documents the shape for manual editing / reference.