[Vonng]

Grafana anonymous access is hardcoded to true, so operators cannot persistently require authentication through the inventory. Add grafana_anon_enabled (default true) to control [auth.anonymous].enabled. Setting it to false survives configuration re-renders; grafana_auth_proxy remains independent and the anonymous role remains Viewer.

Update INFRA defaults, CMDB metadata (ID 198, boolean, G/I), complete EL/Debian inventories, and the role README. Applying the setting requires grafana_config,grafana_launch. Clarify that grafana_view_password belongs to the PostgreSQL datasource.

Validation:

• 28 full-template render cases using Ansible's boolean filter, covering omitted/default/explicit/string values, both proxy settings, and both UI languages; output otherwise matches the previous template.
• Ansible syntax check, YAML and CMDB metadata validation, and consistency checks across the README and bilingual examples.
• Both documentation sites passed make check, including Hugo rendering and full internal-link scans. No old variable names remain in the implementation or documentation source.

Documentation committed directly to main:

• Chinese documentation
• English documentation

Closes #782.