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/nginx/site.conf.tmpl

@@ -1,18 +1,18 @@
 upstream moments_api {
-    server anjie.kosherinata.internal:42424 max_fails=3 fail_timeout=30s;
+    server {{API_UPSTREAM_ADDR}} max_fails=3 fail_timeout=30s;
     keepalive 8;
 }
 
 server {
-    server_name rob.tn;
+    server_name {{SERVER_NAME}};
     listen 443 ssl;
     http2 on;
 
-    ssl_certificate /etc/letsencrypt/live/rob.tn/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/rob.tn/privkey.pem;
+    ssl_certificate /etc/letsencrypt/live/{{SERVER_NAME}}/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/{{SERVER_NAME}}/privkey.pem;
     ssl_protocols TLSv1.2 TLSv1.3;
 
-    root /var/www/rob.tn;
+    root {{DOCROOT}};
     index index.html;
 
     location / {
@@ -28,7 +28,7 @@ server {
 
     location /api/ {
         rewrite ^/api/(.*)$ /$1 break;
-        proxy_pass http://moments_api;
+        proxy_pass {{API_UPSTREAM_SCHEME}}://moments_api;
         proxy_http_version 1.1;
         proxy_set_header Connection "";
         proxy_set_header Host $host;
@@ -38,6 +38,6 @@ server {
         proxy_connect_timeout 5s;
     }
 
-    access_log /var/log/nginx/rob.tn.access.log;
-    error_log  /var/log/nginx/rob.tn.error.log;
+    access_log /var/log/nginx/{{SERVER_NAME}}.access.log;
+    error_log  /var/log/nginx/{{SERVER_NAME}}.error.log;
 }