Fix health endpoint, align with the documented manual runbook

The health router is mounted at prefix="/api" in domaindingo's main.py, so
/health 404s. Checking it would have failed every deploy and rolled back a
perfectly good image.

Also adopts three conventions from the vault's DomainDingo Development note:
recreate a single named service (--no-deps --force-recreate), validate with
compose config --quiet before touching the running container, and write the
rollback record in the documented format and location.

targets.json

@@ -1,6 +1,5 @@
 {
   "version": 1,
-
   "_comment": [
     "Single source of truth for the fleet's continuous-deployment targets.",
     "A target is uniquely identified by (repo, branch). The 'host' field decides",
@@ -10,20 +9,16 @@
     "Adding an environment is an edit here plus a re-run of install/install.sh on",
     "the owning host. It is never a change to the project repository."
   ],
-
   "defaults": {
     "ntfy_base_url": "https://ntfy.fisher.hu",
-
     "image_wait_seconds": 900,
     "image_poll_interval": 15,
-
     "health_retries": 30,
     "health_interval": 5,
-
     "lock_wait_seconds": 600,
-    "compose_timeout_seconds": 300
+    "compose_timeout_seconds": 300,
+    "rollback_record_dir": "."
   },
-
   "hosts": {
     "s5.fisher.hu": {
       "bind": "10.255.255.1",
@@ -34,7 +29,6 @@
       "port": 21600
     }
   },
-
   "targets": [
     {
       "name": "domaindingo-test",
@@ -43,24 +37,21 @@
       "branch": "test",
       "env": "test",
       "host": "s5.fisher.hu",
-
       "stack_dir": "/home/fisher/S/uas-ng/docker/domaindingo/s5.fisher.hu",
       "compose_file": "docker-compose.yml",
       "compose_project": "domaindingo-test",
       "container": "domaindingo-test",
-
+      "compose_service": "domaindingo-test",
       "image_repo": "gitea.fisher.hu/webdev/domaindingo",
       "image_tag_template": "{branch}-sha-{short7}",
       "image_env_var": "DOMAINDINGO_TEST_IMAGE",
       "pull_policy_env_var": "DOMAINDINGO_TEST_PULL_POLICY",
-
-      "health_url": "http://127.0.0.1:9101/health",
+      "health_url": "http://127.0.0.1:9101/api/health",
       "health_expect_key": "db",
       "health_expect_value": "ok",
-
-      "rollback_on_failure": true
+      "rollback_on_failure": true,
+      "rollback_record_dir": "backup-test"
     },
-
     {
       "name": "domaindingo-prod",
       "enabled": true,
@@ -68,22 +59,20 @@
       "branch": "prod",
       "env": "prod",
       "host": "s5.fisher.hu",
-
       "stack_dir": "/home/fisher/S/uas-ng/docker/domaindingo/s5.fisher.hu",
       "compose_file": "docker-compose-prod.yml",
       "compose_project": "domaindingo-prod",
       "container": "domaindingo-prod",
-
+      "compose_service": "domaindingo-prod",
       "image_repo": "gitea.fisher.hu/webdev/domaindingo",
       "image_tag_template": "{branch}-sha-{short7}",
       "image_env_var": "DOMAINDINGO_PROD_IMAGE",
       "pull_policy_env_var": "DOMAINDINGO_PROD_PULL_POLICY",
-
-      "health_url": "http://127.0.0.1:9103/health",
+      "health_url": "http://127.0.0.1:9103/api/health",
       "health_expect_key": "db",
       "health_expect_value": "ok",
-
-      "rollback_on_failure": true
+      "rollback_on_failure": true,
+      "rollback_record_dir": "backup-prod"
     }
   ]
 }