Storage Backend

This module adds a technical foundation for storing files outside the standard Odoo attachment store. Administrators get a new "Storage" menu where they can create storage backends and storage backend categories.

• On a storage backend you set a name, a category, a backend type (only "Filesystem" is available) and a relative directory path. A default "Filesystem Backend" record is created when the module is installed.
• The form shows a "Test connection" button only when the selected backend type supports configuration validation; clicking it displays a success or failure notification.
• Categories group backends so they can be swapped; a category form lists the backends that belong to it.
• The backend record exposes operations to add, read, list, find, move and delete files, which are forwarded to the matching adapter component.
• The filesystem adapter stores files inside the Odoo filestore under a "storage" directory and blocks access to paths outside that base directory.

Access to both the storage backend and storage backend category models is restricted to the Settings administrator group. The module touches storage.backend, storage.backend.category and the underlying base.storage.adapter and filesystem.adapter components. No reports, emails or scheduled jobs are defined.