Align CI/CD with soroush method (DrSousan single-app pattern)

Audited against working Meezi/DrSousan pipelines. Fixes:
- Single docker-compose.yml is the production stack (api + internal db); folded in docker-compose.prod.yml; dev Postgres → docker-compose.dev.yml
- Dockerfile HEALTHCHECK (bash /dev/tcp) so deploy's docker-inspect Health.Status wait works
- Naming to convention: service api, container hamkadr_api/hamkadr_db, image mirror.soroushasadi.com/hamkadr/api:${API_TAG}
- Workflow rewritten to DrSousan pattern: ci build + deploy (rollback-tag before build, pg_dump backup, stop/rm/up, docker-inspect health-wait with crash detection, scoped image prune)
- environment: block with ${VAR:-default} substitution (no hard-failing env_file); HOST_PORT; .env excluded from image context
- nginx vhost + DEPLOY.md updated to match

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,20 @@
+# Local development DB only. Devs run `docker compose -f docker-compose.dev.yml up -d`
+# and `dotnet run` against it. Production uses docker-compose.yml (api + db).
+name: jobsmedical-dev
+
+services:
+  db:
+    image: postgres:17-alpine
+    container_name: jobsmedical-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: jobsmedical
+      POSTGRES_USER: jobsmedical
+      POSTGRES_PASSWORD: jobsmedical_dev
+    ports:
+      - "5433:5432"   # host 5433 to avoid clashing with a local Postgres on 5432
+    volumes:
+      - jobsmedical-pgdata:/var/lib/postgresql/data
+
+volumes:
+  jobsmedical-pgdata: