chore: fix build warnings (unused vars/imports, dead ext4 param/field/fn)

crates/servers/permission-manager/src/server.rs

@@ -1,7 +1,7 @@
 use server_framework::Server;
 use types::id::ProcessId;
 
-use crate::protocol::{CapabilityKind, PermissionRequest, PermissionResponse};
+use crate::protocol::{PermissionRequest, PermissionResponse};
 
 const MAX_PROCESSES: usize = 64;
 const NUM_KINDS: usize = 9;