angular(feat) : file management permission system #21694
BackIntroduce per-item permission flags and UI-level permission handling across file-management. Added new policy names for ManagePermissions and included @abp/ng.permission-management as a dependency. Extended proxy DTOs with canView/canAdd/canEdit/canMove/canDelete flags. Updated components to combine global policy checks with per-item flags: file-management-buttons uses DirectoryDescriptorService to determine canAdd for current folder; directory-tree and folder-content render context menu items conditionally, open a resource permission management modal, and respect per-item can* flags; file-name resolver prevents downloads when view is not allowed. Default entity actions were refactored to use a hasPolicyOrFlag helper (considering both granted policy and item flags) and new permission actions for managing permissions were added. Minor import and template adjustments (removed PermissionDirective usages, added ResourcePermissionManagementComponent, and mapping root id helper).
Description
Resolves #21261 (write the related issue number if available)s and set a milestone for this PR