feat(deploy): manifest-driven config, teardown + db-perms, hardening

deploy.sh:
- never rsync into /; stage to /tmp on the remote and install at final
  paths via sudo bash heredoc, closing the parent-dir attribute leak
  that broke three hosts in the earlier rsync incident
- shell-quote heredoc args via ${var@Q}
- drop -A -X on the remaining (web) rsyncs
- generic worker.secrets loop reads (env-var → pass path) from manifest;
  GITEA_TOKEN now flows through automatically
- in-memory bash substitution for templates (secrets never on argv)
- simplify semanage port labelling: --add 2>/dev/null || --modify (the
  old grep pre-check matched only the first listed port)
- restorecon back to short flags (Fedora policycoreutils has no long
  forms; --recursive errored at deploy time)
- quieter health probe loop: curl diagnostics only on final failure

manifest as source of truth:
- api.config.bind drives BIND_ADDR, firewalld port, semanage label,
  health-probe URL
- web.config.{server_name,root,api_upstream} drives nginx render,
  rsync targets, restorecon scope
- nginx config renamed to site.conf.tmpl; firewalld svc to
  moments-api.xml.tmpl; both rendered at deploy time
- topology flip: api → nikola, worker → frootmig (anjie freed)

new scripts:
- script/teardown.sh: idempotent component teardown, never rsyncs,
  shared-state cleanup gated on absence of remaining env files,
  --remove-docroot guard against shallow / system paths
- script/db-perms.sh: rewritten — fixes grep/append role mismatch that
  appended duplicates on re-run, adds postgres reload, hits primary +
  standby in a single invocation

readme: genericized; deployment topology no longer carries real host
or site names.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

asset/manifest.yml

@@ -3,7 +3,7 @@ environments:
   prod:
     components:
       api:
-        hosts: [anjie.kosherinata.internal]
+        hosts: [nikola.kosherinata.internal]
         config:
           bind: 0.0.0.0:42424
           db_role: moments_ro
@@ -11,7 +11,7 @@ environments:
           db_port: 5432
           db_name: moments
       worker:
-        hosts: [anjie.kosherinata.internal]
+        hosts: [frootmig.kosherinata.internal]
         config:
           db_role: moments_rw
           db_host: magrathea.kosherinata.internal
@@ -27,10 +27,10 @@ environments:
           bugzilla_email: rthijssen@mozilla.com
         secrets:
           GITHUB_TOKEN: github.com/grenade/admin-token
-          # GITEA_TOKEN, BUGZILLA_API_KEY: optional, omit unless required.
+          GITEA_TOKEN: git.lair.cafe/grenade/admin-token
       web:
         hosts: [oolon.kosherinata.internal]
         config:
           server_name: rob.tn
           root: /var/www/rob.tn
-          api_upstream: http://anjie.kosherinata.internal:42424
+          api_upstream: http://nikola.kosherinata.internal:42424