Migrate Existing Core Roles and Permissions to Declarative YAML #411

Description

This task focuses exclusively on translating the existing, built-in Open edX roles and permissions into the new declarative YAML schema for openedx-authz. This step guarantees that the baseline system configuration is accurately modeled in the new format before introducing the Casbin enforcement engine or dynamic REST APIs.

Acceptance Criteria

• Audit Existing Definitions: Identify and document all default roles, permissions, and groupings currently hardcoded or established in the core system.
• YAML Translation: Create the corresponding YAML definition files mapping the audited rules directly into the new openedx-authz schema.
• Metadata Preservation: Ensure all contextual data (like display_name, description, and resource targets) is thoroughly captured in the YAML structure so it isn't lost during the migration.
• Schema Compliance: Validate that the newly created YAML files strictly adhere to the expected format and can be successfully parsed by the Loader (implemented in Issue Core Loader, Compilation, and Definition Validation #410).

Concrete Deliverable

A completed set of YAML files committed to the core module that fully represents the current, legacy authorization state, serving as the static source of truth for the new system.