feat(tops): Taler Operations design previews (ng1–ng3)

Static previews on ports 9090–9092: DD 90 branding (Montserrat,
#0042B3, logo), FINMA sticky, no taler-ops-www build. ng1 landing,
ng2 step/amount sliders + tabs, ng3 classic mirror. Podman nginx,
bin/up.sh, Caddy snippet, /CHANGES notes for current site only.

configs/taler-ops-ng/deploy/compose.yml

@@ -0,0 +1,63 @@
+# Taler Operations design previews — host ports 9090+
+# tops.ng1 → 9090 | tops.ng2 → 9091 | tops.ng3 → 9092
+#
+# Usage (on koopa):
+#   cd ~/koopa-tops && ./bin/up.sh
+
+services:
+  tops-ng1:
+    image: docker.io/library/nginx:1.27-alpine
+    container_name: koopa-tops-ng1
+    restart: unless-stopped
+    ports:
+      - "9090:80"
+    volumes:
+      - ../ng1:/usr/share/nginx/html:ro
+    labels:
+      org.hacktivism.service: tops-ng1
+      org.hacktivism.host_port: "9090"
+      org.hacktivism.site: tops.ng1.hacktivism.ch
+      org.hacktivism.managed_by: koopa-admin
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O", "/dev/null", "http://127.0.0.1/"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
+  tops-ng2:
+    image: docker.io/library/nginx:1.27-alpine
+    container_name: koopa-tops-ng2
+    restart: unless-stopped
+    ports:
+      - "9091:80"
+    volumes:
+      - ../ng2:/usr/share/nginx/html:ro
+    labels:
+      org.hacktivism.service: tops-ng2
+      org.hacktivism.host_port: "9091"
+      org.hacktivism.site: tops.ng2.hacktivism.ch
+      org.hacktivism.managed_by: koopa-admin
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O", "/dev/null", "http://127.0.0.1/"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
+  tops-ng3:
+    image: docker.io/library/nginx:1.27-alpine
+    container_name: koopa-tops-ng3
+    restart: unless-stopped
+    ports:
+      - "9092:80"
+    volumes:
+      - ../ng3:/usr/share/nginx/html:ro
+    labels:
+      org.hacktivism.service: tops-ng3
+      org.hacktivism.host_port: "9092"
+      org.hacktivism.site: tops.ng3.hacktivism.ch
+      org.hacktivism.managed_by: koopa-admin
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O", "/dev/null", "http://127.0.0.1/"]
+      interval: 30s
+      timeout: 5s
+      retries: 3