Add fuelish API; protect the host against memory exhaustion

- fuelish role: receipt OCR API at fuelish.ladkau.de, API-key auth, shared
  Ollama model and request options
- base: 4 GB swap file; act_runner: job containers capped at 4 GB without swap
- docs and vault/service checks updated

ansible/roles/fuelish/handlers/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Restart fuelish
+  community.docker.docker_compose_v2:
+    project_src: "{{ fuelish_data_dir }}"
+    state: present
+    recreate: always