refactor(rbac): migrate API permission checks to resource:action format

Replace all legacy dotted permission codes (vms.view, proxmox.manage, ...)
in PermissionChecker/has_permission across app/api with the new
resource:action format (vm:view, server:manage, ...), per LEGACY_PERMISSION_MAP.
All 33 codes used by the API are now registered in the permission registry.

Also switch the /api/auth/me admin branch to get_all_permissions_v2 so the
endpoint emits permissions in the new format only.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/api/proxmox/tasks.py

@@ -85,7 +85,7 @@ def get_task_status(
     upid: str,
     node: str,
     db: Session = Depends(get_db),
-    current_user: User = Depends(PermissionChecker("vms.view"))
+    current_user: User = Depends(PermissionChecker("vm:view"))
 ):
     """Получить статус задачи по UPID"""
     server = db.query(ProxmoxServer).filter(ProxmoxServer.id == server_id).first()
@@ -115,7 +115,7 @@ def get_task_log(
     start: int = 0,
     limit: int = 50,
     db: Session = Depends(get_db),
-    current_user: User = Depends(PermissionChecker("vms.view"))
+    current_user: User = Depends(PermissionChecker("vm:view"))
 ):
     """Получить лог задачи по UPID"""
     server = db.query(ProxmoxServer).filter(ProxmoxServer.id == server_id).first()