feat: deploy gelf-proxy as container via Gitea registry

- Add Gitea container registry login task
- Add graylog.yml with full stack (MongoDB, OpenSearch, Graylog, gelf-proxy)
- Use container image instead of binary for gelf-proxy
- Image tagged from git.debyl.io/debyltech/gelf-proxy

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/roles/podman/tasks/gitea/podman-gitea-login.yml

@@ -0,0 +1,8 @@
+---
+- name: podman login to Gitea Container Registry
+  become: true
+  become_user: "{{ podman_user }}"
+  containers.podman.podman_login:
+    registry: "git.debyl.io"
+    username: "{{ gitea_registry_username }}"
+    password: "{{ gitea_registry_token }}"