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Description

Implement endpoint to list all available permissions.

Endpoint: GET /api/v1/permissions

Response: List of all permissions with descriptions

Required Permissions: Any authenticated user (read-only)

Implementation Requirements:
- Return all 27 permissions
- Group by category (user, workflow, execution, admin)
- Include description for each
- Include which roles have each permission

Permission Categories:
- User Management: user:create, user:read, user:update, user:delete
- Role Management: role:assign, role:revoke
- Workflow: workflow:create, workflow:read, workflow:update, workflow:delete, workflow:execute
- Execution: execution:read, execution:cancel, execution:retry
- Events: event:read, event:emit
- Schedules: schedule:create, schedule:read, schedule:update, schedule:delete
- Admin: admin:audit, admin:settings, admin:tokens, admin:api_keys, admin:invitations
- System: system:tenant_manage, system:system_settings

With ultra attention to details and correctness.
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Edit Issue #69