recipe-maintainer: public snapshot (secrets + deployment plans removed, single commit)

Sanitized single-commit public mirror of recipe-maintainer.
- Removed test-ssh/.testenv (live creds); added test-ssh/.testenv.example placeholders.
- Removed plans/ and planned-updates/ (deployment-planning docs) so no client/
  deployment domains appear in the public repo.
- All other secret stores were already gitignored.
- docs.coopcloud.tech retained as a submodule (public upstream).

recipe-info/custom-html/setup.md

@@ -0,0 +1,43 @@
+# Custom HTML — First-Time Setup
+
+## Prerequisites
+
+- DNS: `custom-html.<DOMAIN_SUFFIX>` must resolve to the server
+
+## Steps
+
+1. **Create the app:**
+   ```bash
+   abra app new custom-html --server <SERVER> --domain custom-html.<DOMAIN_SUFFIX> --no-input
+   ```
+
+2. **Deploy:**
+   ```bash
+   abra app deploy custom-html.<DOMAIN_SUFFIX> --chaos --force --no-input
+   ```
+   No secrets required.
+
+3. **Copy your HTML content:**
+   ```bash
+   abra app cp custom-html.<DOMAIN_SUFFIX> index.html app:/usr/share/nginx/html
+   ```
+
+4. **Verify:** curl `https://custom-html.<DOMAIN_SUFFIX>` returns HTTP 200.
+
+## Optional: SSH/SFTP uploads
+
+To allow SFTP file management, edit the app env file and uncomment:
+```
+COMPOSE_FILE="$COMPOSE_FILE:compose.sftp.yml"
+PUBLIC_KEY="ssh-ed25519 AAAA... user@host"
+```
+Then redeploy. Connect via `ssh -p 2220 sftp@custom-html.<DOMAIN_SUFFIX>`.
+
+## Optional: Git-pull from a repo
+
+Uncomment in the env file:
+```
+COMPOSE_FILE="$COMPOSE_FILE:compose.git-pull.yml"
+GIT_REPO_URL="https://..."
+CRON_SCHEDULE="*/5 * * * *"
+```