Add grafana datasource provisioning and update workflow docs

- Configure grafana to use provisioned datasources instead of UI config
- Add prometheus datasource template managed by ansible
- Create minimal grafana.ini with custom provisioning path
- Move ansible_managed to group_vars (fixes deprecation warning)
- Add Remote Hosts and Git Workflow sections to CLAUDE.md
- Document feature branch workflow with tea CLI for PRs

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

CLAUDE.md

@@ -55,7 +55,7 @@ tea pr create --title "Description of change" --description "Details..."
 
 PRs are reviewed and merged via the Forgejo web UI at https://forge.tail8d86e.ts.net.
 
-After creating a PR, offer to open it in the browser with `open <pr-url>`.
+After creating a PR, run `open <pr-url>` to open it in the browser (Claude Code's UI will prompt for permission).
 
 ## Ansible